we can go back to the cave if you like.

In order to achieve independence, we must rely on our own strength.

数学中最重要的是理解概念，而不仅仅是记忆公式。

写作是一种乐观的行为。

If you are not willing to learn, no one can help you. If you are determined to learn, no one can stop you.

人无远虑，必有近忧。如果做事没有计划，毫无思想准备，就不能从容应付突如其来的事情。