Be slow to fall into friendship，but when you are in，continue firm and constant.

幸福不是好运或外部事件的结果，而是我们解释这些事件的方式。

When people talk to us about others, they are usually dull. When they talk to us about themselves, they are nearly always interesting.

"Language is the only homeland."

生活的全部秘诀在于对一件事深感兴趣，对一千件事都感兴趣。

When you solve a mathematical problem, you don't just get the answer - you understand why it's the answer.