朋友发来一封email, 一句话让我 can’t agree any more!  

“Old age is like a bank account.  You withdraw from what you've put in.”

那么，我们正在存些什么呢？ 

如果你的选择也是快乐，下面的才会有用： 

The five simple rules to be happy:

1. Free your heart from hatred.
2. Free your mind from worries.
3. Live simply.
4. Give more.
5. Expect less.