Do not fear to be eccentric in opinion， for every opinion now accepted was once eccentric.

The most elegant proofs are those that reveal the heart of the problem with clarity.

The secret of being miserable is to have leisure to bother about whether you are happy or not.

每一件艺术品都是向观者提出的一个问题。

真理永远不会伤害一个正义的事业。