Freedom and order are not incompatible; truth is strength; free discussion is the very life of truth.  
数学不是一项观赏性运动。你必须参与其中。
白日梦的代价总是这一刻的回归,与之前的一切重新对齐,而现在看起来似乎更糟了一些。
The next generation will solve the problems we can’t.
The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.