有时候最难的事情和最正确的事情是同一件事。
Sometimes the hardest thing and the right thing are the same.
The best time to plant a tree was 20 years ago; the second-best time is now.
It is a common experience that a problem difficult at night is resolved in the morning after the committee of sleep has worked on it.
As you grow older, you will discover that you have two hands, one for helping yourself, the other for helping others.
你可以成为任何你想成为的人。
在合适的人手中，一本书可能比刀更危险。