If someone tells you he is going to make a “realistic decision”, you immediately understand that he has resolved to do something bad.

数学中最美丽的东西是复杂背后的简单思想。

Sometimes we get sad about things and we don’t like to tell other people that we are sad about them. We like to keep it a secret. Or sometimes, we are sad but we really don’t know why we are sad, so we say we aren’t sad but we really are.

The greatest glory in living lies not in never falling, but in rising every time we fall.