Find the minimum larger node in binary search tree for a giving node.

Question:
Find the minimum larger node in binary search tree for a giving node.
Answer:
struct BSTreeNode {
BSTreeNode* pLeft;
BSTreeNode* pRight;
BSTreeNode* pParent;
int value;
};
BSTreeNode* findMinLarge(BSTreeNode* node) {
if (!node)
return 0;
if (Node* result = node->pRight) {
while (result && result->pLeft) {
result = result->pLeft;
}
return result;
}
if (node->pParent == 0) {
return 0;
}
if (node->pParent->pLeft == node)
return node->pParent;
BSTreeNode* parent = node->pParent;
BSTreeNode* pparent = parent->pParent;
while (1) {
if (pparent && pparent->pLeft == parent) {
return pparent;
}
if (!pparent)
break;
parent = pparent;
pparent = parent->pParent;
}
return 0;
}

the devils out of the man

鬼被赶出

        耶稣问他说：“你名叫什么？”他说：“我名叫‘群’”；这是因为附着他的鬼多。 鬼就央求耶稣，不要吩咐他们到无底坑里去。那里有一大群猪在山上吃食。鬼央求耶稣，准他们进入猪里去。耶稣准了他们， 鬼就从那人出来，进入猪里去。于是那群猪闯下山崖，投在湖里淹死了。 (路加福音 8:30-33 和合本)

        And Jesus asked him, saying, What is thy name?And he said, Legion: because many devils were entered into him.And they besought him that he would not command them to go out into the deep.And there was there an herd of many swine feeding on the mountain: and they besought him that he would suffer them to enter into them. And he suffered them.Then went the devils out of the man, and entered into the swine: and the herd ran violently down a steep place into the lake, and were choked. (Luke 8:30-33 KJV)

         耶稣问这人的名字，得到的回答是群，这似乎是在说有一整个军团的鬼进到他里面（一个罗马军团约有六千个士兵）。可见这个人里面住了很多鬼。那些鬼知道它们必须离开这人，就不断恳求耶稣不要吩咐它们到无底坑里去。无底坑是拘禁群鬼、甚至撒但的所在（启二十1及下）。它们央求耶稣准许它们进到正在附近吃食的一大群猪里面去，耶稣准了它们，鬼就离了那人，进入猪里去。那猪群闯下山崖，投在湖里淹死了。这里可能有人会问耶稣竟牺牲猪群的主人来医治这个人？对这个问题，基本的答复应该是：这人的痊愈要比一群猪重要得多。可有任何人当真以为猪应该得救，而这人应该继续留在不得救的情景中吗？同样地，发拉尔指出：“对于全城而言，将邻舍从这野蛮疯子的危险和恐惧中释放出来，这个收益要比损失这群猪更大。”我们也要记得：耶稣既未打发鬼进到猪里去（祂不过是准许它们罢了），也没有打发猪投到湖里去（这故事并未说祂愿意猪死亡）。

Where is your faith?

这到底是谁？

耶稣对他们说：“你们的信心在哪里呢？”他们又惧怕又希奇，彼此说：“这到底是谁？他吩咐风和水，连风和水也听从他了。” (路加福音 8:25 和合本)

And he said unto them, Where is your faith?And they being afraid wondered, saying one to another, What manner of man is this! for he commandeth even the winds and water, and they obey him. (Luke 8:25 KJV)

祂查问，你们的信心在哪里呢？暗示门徒不该惧怕，他们应该信靠祂。可见耶稣希望门徒对祂有信心。他们对这件事的反应，仿佛是见了神的面一样。他们充满了敬畏（惧怕），他们惊奇地问：“这到底是谁？”这是重要的问题，路加不容他的读者忽略它。这件事情，更新了门徒对耶稣的认识，他们更深地认识了祂的奥秘和奇妙。这才是最大的收获。今日的世界，充满艰难试探，很多时候神的计划看起来似乎岌岌可危。基督似乎睡着了。但是，不要叫醒祂。不要以为神想藉着你我的手来保护方舟，来托起小船。祂不需要这样作。

Rebuild Binary Tree from Preorder and Inorder Traversal

Question:
struct NODE {
NODE* pLeft;
NODE* pRight;
char chValue;
};
e.g.
preorder traversal : a b d c e f
inorder traversal : d b a e c f

Answer:

include

using namespace std;

struct NODE {
NODE* pLeft;
NODE* pRight;
char chValue;
};

void PrintPreOrder(NODE* pRoot) {
if (!pRoot)
return;
cout << pRoot->chValue;
PrintPreOrder(pRoot->pLeft);
PrintPreOrder(pRoot->pRight);
}

void PrintInOrder(NODE* pRoot) {
if (!pRoot)
return;
PrintInOrder(pRoot->pLeft);
cout << pRoot->chValue;
PrintInOrder(pRoot->pRight);
}

void Rebuild(char* pPreOrder, char* pInOrder, int nTreeLen, NODE** pRoot) {
if (pPreOrder == 0 || pInOrder == 0)
return;
NODE* pTemp = new NODE;
pTemp->pLeft = 0;
pTemp->pRight = 0;
pTemp->chValue = *pPreOrder;
if (pRoot == 0)
pRoot = pTemp;
if (nTreeLen == 1)
return;
char pOrgInOrder = pInOrder;
char pLeftEnd = pInOrder;
int nTempLen = 0;
while (*pPreOrder != *pLeftEnd) {
nTempLen++;
if (nTempLen > nTreeLen)
break;
pLeftEnd++;
}
int nLeftLen = (int)(pLeftEnd - pOrgInOrder);
int nRightLen = nTreeLen - nLeftLen - 1;
if (nLeftLen > 0)
Rebuild(pPreOrder+1, pInOrder, nLeftLen, &(pTemp->pLeft));
if (nRightLen > 0)
Rebuild(pPreOrder+nLeftLen+1, pInOrder + nLeftLen + 1, nRightLen, &(pTemp->pRight));
}

int main() {
char* pPreOrder = "abdcef";
char* pInOrder = "dbaecf";
NODE* pRoot = 0;
int nTreeLen = 6;
Rebuild(pPreOrder, pInOrder, nTreeLen, &pRoot);
PrintPreOrder(pRoot);
cout << endl;
PrintInOrder(pRoot);
cout << endl;
return 0;
}

Array Right Shift K Steps

Question:
An array has N numbers, move each elements to right for K steps.
time limit : O(N)
e.g.
abcd1234 move 4 steps turns out
1234abcd
Answer:
void Reverse(int* arr, int b, int e)
{
for (; b < e; b++, e--) {
int temp = arr[e];
arr[e] = arr[b];
arr[b] = temp;
}
}
void RightShift(int* arr, int N, int K)
{
K %= N;
Reverse(arr, 0, N - K - 1);
Reverse(arr, N-K, N-1);
Reverse(arr, 0, N-1);
}

Therefore do not worry about tomorrow

“所以我告诉你们，不要为生命忧虑吃什么，喝什么；为身体忧虑穿什么。生命不胜于饮食吗？身体不胜于衣裳吗？  (马太福音 6:25 和合本)
“Therefore I tell you, do not worry about your life, what you will eat or drink; or about your body, what you will wear. Is not life more than food, and the body more than clothes? (Matthew 6:25 NIV)
你们看那天上的飞鸟，也不种，也不收，也不积蓄在仓里，你们的天父尚且养活它。你们不比飞鸟贵重得多吗？  (马太福音 6:26 和合本)
Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them. Are you not much more valuable than they? (Matthew 6:26 NIV)
你们哪一个能用思虑使寿数多加一刻呢（或译：使身量多加一肘呢） ？  (马太福音 6:27 和合本)
Can any one of you by worrying add a single hour to your life ? (Matthew 6:27 NIV)
何必为衣裳忧虑呢？你想野地里的百合花怎么长起来；它也不劳苦，也不纺线。  (马太福音 6:28 和合本)
“And why do you worry about clothes? See how the flowers of the field grow. They do not labor or spin. (Matthew 6:28 NIV)
然而我告诉你们，就是所罗门极荣华的时候，他所穿戴的，还不如这花一朵呢！  (马太福音 6:29 和合本)
Yet I tell you that not even Solomon in all his splendor was dressed like one of these. (Matthew 6:29 NIV)
你们这小信的人哪！野地里的草今天还在，明天就丢在炉里，　神还给它这样的妆饰，何况你们呢！  (马太福音 6:30 和合本)
If that is how God clothes the grass of the field, which is here today and tomorrow is thrown into the fire, will he not much more clothe you—you of little faith? (Matthew 6:30 NIV)
所以，不要忧虑说，吃什么？喝什么？穿什么？  (马太福音 6:31 和合本)
So do not worry, saying, ‘What shall we eat?’ or ‘What shall we drink?’ or ‘What shall we wear?’ (Matthew 6:31 NIV)
这都是外邦人所求的。你们需用的这一切东西，你们的天父是知道的。  (马太福音 6:32 和合本)
For the pagans run after all these things, and your heavenly Father knows that you need them. (Matthew 6:32 NIV)
你们要先求他的国和他的义，这些东西都要加给你们了。  (马太福音 6:33 和合本)
But seek first his kingdom and his righteousness, and all these things will be given to you as well. (Matthew 6:33 NIV)
所以，不要为明天忧虑，因为明天自有明天的忧虑；一天的难处一天当就够了。” (马太福音 6:34 和合本)
Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of its own. (Matthew 6:34 NIV)

Find the smallest k elements

Question:
Find the smallest k elements
Answer:
void findkmin(int *array, int len, int k) {
  int* kmin = new int[k];
  if (len <= k) {
    for (int i = 0; i < len; i++)
      kmin[i] = array[i];
  }
  else {
    for (int i = 0; i < len; i++) {
      int j;
      for (j = 0; j < ((i < k) ? i : k); j++) {
        if (kmin[j] > array[i])
          break;
      }
      if (j < k) {
        for (int m = k-1; m > j; m--)
          kmin[m] = kmin[m-1];
        kmin[j] = array[i];
      }
    }
  }
  for (int i = 0; i < k; i++)
    cout << kmin[i] << " ";
  cout << endl;
  delete [] kmin;
}

Largest subarray max sum problem

Question:
Write an efficient C program to find the sum of contiguous subarray within a one-dimensional array of numbers which has the largest sum.
some numbers are negative.
Time Complexity: O(n)

Answer:
void maxsumofsubarray(int* array, int len) {
int curMax = 0;
int mi = -1;
int mj = -1;
int max;
bool max_init = false;
for (int i = 0; i < len; i++) {
if (curMax <= 0) {
curMax = array[i];
mi = i;
mj = i;
} else {
curMax += array[i];
}
if (!max_init || max < curMax) {
max = curMax;
mj = i;
max_init = true;
}
}
for (int i = mi; i <= mj; i++) {
cout << array[i] << " ";
}
cout << endl;
cout << " max sub array sum is " << max << endl;
}

Jesus's mother and brethren

耶稣的母亲和弟兄

        耶稣的母亲和他弟兄来了，因为人多，不得到他跟前。 有人告诉他说：“你母亲和你弟兄站在外边，要见你。” 耶稣回答说：“听了神之道而遵行的人就是我的母亲，我的弟兄了。” (路加福音 8:19-21 和合本)

        Then came to him his mother and his brethren, and could not come at him for the press.And it was told him by certain which said, Thy mother and thy brethren stand without, desiring to see thee.And he answered and said unto them, My mother and my brethren are these which hear the word of God, and do it. (Luke 8:19-21 KJV)

        耶稣的母亲和弟兄来找耶稣，可是因为人太多，到不了耶稣的跟前。 “有人告诉祂说：‘你母亲和你弟兄站在外边，要见你。’”按照一般人的观念，听说母亲和兄弟来了，应该停下讲道，赶快前往迎接。然而出于人意料的是，“他却回答那人说：‘谁是我的母亲？谁是我的弟兄？’就伸手指着门徒，说：‘看哪，我的母亲，我的弟兄。凡遵行我天父旨意的人，就是我的弟兄姐妹和母亲了。’”(太 12:48-50 ) 即祂的母亲和弟兄是听了神的道而遵行的人。那些接近耶稣的人，乃是那些认真负起他们向着神的职责之人。这并不意味着家庭的维系是不重要的、或可忽略的，耶稣不是在否认祂的家庭，甚至当祂为了完成救赎世人的工作而被挂在十字架上时，祂在痛苦中仍然想到祂的母亲（约十九26-27）。祂的意思是：我们对神的职责必须优于其他一切。

Transform the binary search tree into a sorted two-way linked list

Question:
Transform the binary search tree into a sorted two-way linked list.
do not use recursion.
do not create any new node, only adjust the pointer to point.
10
/ \
6 14
/ \ / \
4 8 12 16
-->>
4=6=8=10=12=14=16

struct BSTreeNode
{
int m_nValue; // value of node
BSTreeNode *m_pLeft; // left child of node
BSTreeNode *m_pRight; // right child of node
};

Answer:
inline BSTreeNode* eleminateMinNode(BSTreeNode** tree) {
BSTreeNode* treeHead = tree;
if (!treeHead)
return 0;
BSTreeNode treeHeadParent = 0;
while (treeHead->m_pLeft) {
treeHeadParent = treeHead;
treeHead = treeHead->m_pLeft;
}
if (treeHeadParent)
treeHeadParent->m_pLeft = treeHead->m_pRight;
if (treeHead == *tree)
*tree = treeHead->m_pRight;
return treeHead;
}

inline BSTreeNode* eleminateMaxNode(BSTreeNode** tree) {
BSTreeNode* treeHead = tree;
if (!treeHead)
return 0;
BSTreeNode treeHeadParent = 0;
while (treeHead->m_pRight) {
treeHeadParent = treeHead;
treeHead = treeHead->m_pRight;
}
if (treeHeadParent)
treeHeadParent->m_pRight = treeHead->m_pLeft;
if (treeHead == *tree)
*tree = treeHead->m_pLeft;
return treeHead;
}

void BSTreeToDoubleLinkChainInternal(BSTreeNode* tree, BSTreeNode** headp, BSTreeNode** tailp) {
if (!tree)
return;
BSTreeNode* tail = tree;
BSTreeNode* right = tail->m_pRight;
BSTreeNode* minRight = eleminateMinNode(&right);
while (minRight && minRight != tail) {
tail->m_pRight = minRight;
minRight->m_pLeft = tail;
tail = minRight;
minRight = eleminateMinNode(&right);
}
tail->m_pRight = 0;
BSTreeNode* left = tree->m_pLeft;
BSTreeNode* maxLeft = eleminateMaxNode(&left);
BSTreeNode* head = tree;
while (maxLeft && maxLeft != head) {
head->m_pLeft = maxLeft;
maxLeft->m_pRight = head;
head = maxLeft;
maxLeft = eleminateMaxNode(&left);
}
head->m_pLeft = 0;
*headp = head;
*tailp = tail;
}

Take heed therefore how ye hear

恩赐

所以，你们应当小心怎样听；因为凡有的，还要加给他；凡没有的，连他自以为有的，也要夺去。” (路加福音 8:18 和合本)

Take heed therefore how ye hear: for whosoever hath, to him shall be given; and whosoever hath not, from him shall be taken even that which he seemeth to have. (Luke 8:18 KJV)

这句话与撒种的比喻和交银的比喻（19:26）连在一起。正确的听是很重要的，不要像比喻中那不结果实的种子。“凡有的还要加给他”，也是在提醒我们同一个功课。这当然不是个鼓励有钱阶级的信息，它是与听神的道有关的。也就是说，当一个人，谦卑地领受主的教导，那么神就会把更多的真理赐给他，让他明白的更多，领受的更多。如果一个人，在神面前骄傲，他不仅没有办法领受到更多真理，甚至连自己已经明白的一些也会失去。这样的观念，也可以用在恩赐的使用上，如果我们认真使用神所赐的，就有添加，如果不用，甚至连我们自以为有的也会失去。

Reset user password for your own Ghost blog

If you do not config mail up for your ghost blog,
it maybe a big problem once you lost your user password.
however, methods are always more than problems.
We can fix it up by reset it.

1. Find out your database name in your ghost config, it is maybe in config.production.json
  "database": {
    "client": "mysql",
    "connection": {
      "host": "localhost",
      "user": "ghost-452",
      "password": "dade1b0565f2585e07c7",
      "database": "ghost_production_acm"
2. Use mysql to reset the password.
mysql -u root -p
Enter the password for root account.
mysql> use ghost_production_acm;
mysql> select * from users;
ghost use bcrypthash for the password.
You can get bcrypt hash string from http://bcrypthashgenerator.apphb.com/

mysql>update users set password='

$2b$10$PaL8tKcU4i0CsjRrM6BhROVQMwwLFw2HSx/kWlAUgja23fNllc2Fy' where email='your@email';

#Additionally : if the account has been locked, 

#you can set status to active to unlock the account, like that:

#update users set status = “active”;

mysql>flush privileges;

mysql>quit

3.Restart your ghost blog and login again.

ghost stop

ghost start

config.production.json

Set up multi web server on a single VPS via ghost

First please refer to set up ghost on your VPS.
Set up ghost(a fully open source, hackable platform for building and running a modern online publication) on your google compute engine.

Set up ghost(a fully open source, hackable platform for building and running a modern online publication) on your google compute engine.

Refers:
https://docs.ghost.org/docs
https://ghost.org/

Ubuntu 16.04 is recommended as your server OS.

If you are first login into your blog server,
Please Create a New User and Give Super User Privileges as well.
$adduser <user>
$usermod -aG sudo <user>
$su - <user>

Install Pre-requisites:
$sudo apt-get update
$sudo apt-get upgrade
#nginx
$sudo apt-get install nginx
$sudo ufw allow 'Nginx Full'
$sudo apt-get install mysql-server
#Warning
During mysql installation, you will be prompted to create a root password. Please ensure that you actually specify a value for this, as leaving the root password blank will make Ghost-CLI unable to connect to the database.

#Adding swap memory if needed
If your system has less than 1GB memory, you may run into errors. To overcome this, configure a larger amount of swap memory:
$dd if=/dev/zero of=/var/swap bs=1k count=1024k
$mkswap /var/swap
$swapon /var/swap
$echo '/var/swap swap swap default 0 0' >> /etc/fstab

#nodejs
$curl -sL https://deb.nodesource.com/setup_6.x | sudo -E bash
$sudo apt-get install -y nodejs

#install ghost-cli
$sudo npm i -g ghost-cli

#install ghost
$sudo mkdir -p /var/www/ghost
$sudo chown [user]:[user] /var/www/ghost
$cd /var/www/ghost
$ghost install

#The CLI will asks you for the minimum required information.
Enter your blog Url:

This is the url your blog will be available at and must include the protocol. e.g http://myblog.com for HTTP or https://myblog.com for HTTPS.

If you want to setup SSL, your domain must already be pointing at your server. If your domain is ready and resolved, then you can enter the https version of your domain, and choose "yes" later when asked if you want to setup SSL.

If your domain is not yet ready, enter the http version of your domain and choose no when prompted about SSL. When your domain is resolved, you can run ghost config url [https domain] && ghost setup ssl to run the ssl setup.
Enter your MySQL hostname [localhost]:

This determines where your MySQL database can be accessed from. For the most cases the user installs MySQL on the same server, in this case use localhost (press [enter] to use the default value).
Enter your MySQL username:

Enter your MySQL username. If you have already created a mysql user, password and database with the correct credentials ready for Ghost, enter those details now. Else, enter root and your MySQL root password and Ghost will generate a custom MySQL user for you.
Enter your MySQL password: [hidden]

The password for the MySQL user you entered in the previous step.
Ghost database name:

Here you have to enter the name of your database. If you install multiple instances of ghost on your server you need to specify a different database for each instance. If the database you entered does not exist already and you provided your root credentials it will be created for you.

If you pass a non-root MySQL username and password, this database must already exist and your user must have privileges for this database.
Do you wish to set up a ghost MySQL user?

If you provided your root MySQL user, Ghost CLI can create a custom MySQL user that can only access/edit your Ghost database. This is recommended, and Ghost-CLI takes care of this for you if you accept.
Do you wish to set up nginx?

Sets NGINX up for your blog enabling it to be viewed by the outside world. You can optionally set this up yourself.
Do you wish to set up ssl?

If you do not already have a valid ssl certificate installed for your blog and wish to use secure protocol, Ghost-CLI can take of this for you using the Let's Encrypt certification service. Otherwise you have to setup ssl by your own.

Your domain must have resolved to your server in order for the SSL setup to work. If you choose no now, you can run ghost setup ssl later to rerun this step.
Enter your email (used for SSL certificate generation)

This is required for SSL certification so that you can be kept informed if there is any issue with your certificate such as requiring renewal.
Do you wish to set up systemd?

systemd is the recommended process manager tool for keeping Ghost running. Choose yes to have it configured for you, or no if you're happy setting up process management yourself.
Do you want to start Ghost?

Choose whether you want to have Ghost running right away.

#Once install done, let's start your blog.
$ghost  start

Then you can open your blog url via any web browser. e.g. my blog:
https://errong.win

You can login into your ghost blog via https://[blogurl]/ghost
e.g. my blog ghost admin area.
https://errong.win/ghost

Set up proxy server on your google compute engine via squid

Install squid
    sudo apt install squid3
   
Install apache utils
    sudo apt-get install apache2-utils
    This Installs the htpasswd utility that allows for creating password files.
   
Copy the default configuration file to back it up.
    This configuration file is ridiculously huge and has way more than any simple case would need.  We will just back it up and make a new one with only the information that we need.
    sudo cp /etc/squid/squid.conf /etc/squid/squid.conf.original
       
Delete the old configuration file
    sudo rm /etc/squid/squid.conf

Make a new configuration files
    sudo vi /etc/squid/squid.conf
   
Enter this in the config file
    auth_param basic program /usr/lib/squid/basic_ncsa_auth /etc/squid/passwords
    auth_param basic realm proxy
    acl authenticated proxy_auth REQUIRED
    http_access allow authenticated

    # Choose the port you want. Default is 3128, but we set it to 7777
    http_port 7777
    The first bit (4 lines) sets squid to require passwords
    The last bit configures squid to use port 7777.  You can change this to anything you want.
    Save the file in vi with [esc]:wq
   
Set up the username and password
    sudo htpasswd -c /etc/squid/passwords [username]
    Replace [username] with any username you want to use
    You will be asked to enter and reenter a password for the username that you entered.  make sure they match.
   
Restart the squid service
    sudo systemctl restart squid.service

The last step, please not forget to set up a new firewall rule for http_port

 四种结果

         “这比喻乃是这样：种子就是神的道。 那些在路旁的，就是人听了道，随后魔鬼来，从他们心里把道夺去，恐怕他们信了得救。 那些在磐石上的，就是人听道，欢喜领受，但心中没有根，不过暂时相信，及至遇见试炼就退后了。 那落在荆棘里的，就是人听了道，走开以后，被今生的思虑、钱财、宴乐挤住了，便结不出成熟的子粒来。 那落在好土里的，就是人听了道，持守在诚实善良的心里，并且忍耐着结实。” (路加福音 8:11-15 和合本)

        Now the parable is this: The seed is the word of God.Those by the way side are they that hear; then cometh the devil, and taketh away the word out of their hearts, lest they should believe and be saved.They on the rock are they, which, when they hear, receive the word with joy; and these have no root, which for a while believe, and in time of temptation fall away.And that which fell among thorns are they, which, when they have heard, go forth, and are choked with cares and riches and pleasures of this life, and bring no fruit to perfection.But that on the good ground are they, which in an honest and good heart, having heard the word, keep it, and bring forth fruit with patience. (Luke 8:11-15 KJV)

        在听道的人群中，有一些人是属于第一种情况，如文士们，他们心里早已有了自己的主张，魔鬼早已把很多错误的道理塞在他们的心里，使他们把这些错误的道理当作正确的，他们用他们所相信的，所以为的这些道理，去判断一切，以至于真理根本无法进入他们的心。今天，有人以为无神论是正确的，有人认为佛教的理论是正确的，也有人笃信可兰经的理论，所以他们的心再也没有办法听见别的。魔鬼就是那迷惑人的，把错误的道理充满人的心，目的就是为了抵挡圣经的真理，这就是飞鸟来吃尽了的现象。

        也有一些人，他们听了道，情感上愿意接受，很兴奋，但是并没有让主的道深深地进入他们的心里，也没有把自己的生命真正的交托主。他们觉得这道很好，就接受了，一旦为主的道遭遇艰难和痛苦，他们马上就退后了，这是第二种情况！

       第三种情况是，他们觉得主很好，也愿意接受相信，但是他们放不下这个世界，各种各样的思虑、钱财等等的迷惑，以致他们不能够真心的跟随主！就像那个来找主的少年财主，最后因着放不下钱财，忧忧愁愁地走了。

        而最后一种人，就像彼得保罗这些人，他们有一个诚实的心，听见主的道，蒙了光照后，就接受耶稣基督作他们的救主。既是真理，他们就不顾一切地跟随，不管遇到多少艰难险阻，也跟随到底，以至于结果累累，这就是最后一种田地。

 用比喻的目的

        门徒问耶稣说：“这比喻是什么意思呢？” 他说：“　神国的奥秘只叫你们知道；至于别人，就用比喻，叫他们看也看不见，听也听不明。” (路加福音 8:9-10 和合本)

        And his disciples asked him, saying, What might this parable be?And he said, Unto you it is given to know the mysteries of the kingdom of God: but to others in parables; that seeing they might not see, and hearing they might not understand. (Luke 8:9-10 KJV)

         耶稣用一些普通的言论作为起头，来答复门徒对这个故事的询问。祂把门徒跟其他人作比较：特别强调你们。神国的奥秘是启示给他们的。真秘（mystēria)是那些我们自己永远无法发现，但神已经将之启示出来的真理；这个字在保罗书信中很常见，但在福音书中却只出现在与此有关的经文中。但至于别人，看却看不见，听也听不明；他们听见了比喻，却不明白它们的意义。比喻启示了真理，同时也把真理隐藏起来：它们把真理向诚心寻求的人启示出来，他们不厌其烦的在表面底下挖掘，发现其意义；但它们也把真理向那只以听听故事为满足的人隐藏起来。这很明显是比喻的结果，但耶稣却说这也是它们的目的（叫……）。对那些认真的人而言，比喻是知识的矿场；但对那些随随便便、漫不经心的人来说，它们是个审判。求主怜悯我们，让我们成为谦卑跟随主的人，因为主向谦卑跟随他的人就显出来，向骄傲的人就藏起来，所以我们要不断地求主保守我们的心，始终有一颗谦卑受教寻求的心。

Hey, ghost my blog, https://errong.win

Hey, ghost my blog!
https://errong.win

How to fix up sendgrid-python, BadRequestsError

Traceback (most recent call last):
  File "sendmail.py", line 79, in <module>
    response = sg.client.mail.send.post(request_body=mail.get())
  File "/home/errong_leng/.local/lib/python2.7/site-packages/python_http_client/client.py", line 227, in http_request
    return Response(self._make_request(opener, request))
  File "/home/errong_leng/.local/lib/python2.7/site-packages/python_http_client/client.py", line 161, in _make_request
    raise exc
python_http_client.exceptions.BadRequestsError

The easy way is to catch this exception and print out the error body:
try:
    response = sg.client.mail.send.post(request_body=mail.get())
    print(response.status_code)
    print(response.body)
    print(response.headers)
except Exception as e:
    print (e.body)  #print (e.read()) 

Then you can know why bad request error reported, such as:
{"errors":[{"message":"Following RFC 1341, section 7.2, if either text/html or text/plain are to be sent in your email: text/plain needs to be first, followed by text/html, followed by any other content.","field":"content","help":null}]}

{"errors":[{"message":"The subject is required. You can get around this requirement if you use a template with a subject defined or if every personalization has a subject defined.","field":"subject","help":"http://sendgrid.com/docs/API_Reference/Web_API_v3/Mail/errors.html#message.subject"}]}

{"errors":[{"message":"Each email address in the personalization block should be unique between to, cc, and bcc. We found the first duplicate instance of [errong.leng@gmail.com] in the personalizations.0.to field.","field":"personalizations.0","help":"http://sendgrid.com/docs/API_Reference/Web_API_v3/Mail/errors.html#message.recipient-errors"}]}

Set up shadowsocks server on your google compute engine(ubuntu os) from shadowsocks-libev sources.

Refers:
https://github.com/shadowsocks/shadowsocks-libev