写作的行为是一种勇气的行为。

Understanding a question is half an answer.

Don't let yesterday take up too much of today.

他们做事，上尊敬天，中敬奉鬼神，下关爱百姓。 

Successful investing is about having the discipline to stick to a well-thought-out plan.

数学的本质在于它的自由。