A writer must be stubborn, must have a vocation of sacrifice, and must accept that literature is a very cruel mistress.
The best illustrations are those that leave room for the reader's imagination.
Think small. If you think small, you'll stay small. If you think big, you'll stay big.
The best way to learn mathematics is to do mathematics.
我们唯一需要害怕的就是害怕本身。
If you don't make mistakes, you're not trying hard enough.