在数学中，最简单的解释往往是最深刻的。
In mathematics, the simplest explanation is often the most profound.
The highest manifestation of life consists in this: that a being governs its own actions. A thing which is always subject to the direction of another is somewhat of a dead thing.
You are the artist of your own life.
我们应当谨记，儿童爱我们，而且还很想服从我们。
The best time to plant a tree was 20 years ago. The second best time is now.
我们都在等待什么，即使我们不知道那是什么。