否！俄国是俄国，中国是中国。俄国有俄国的主义，中国有中国的主义。我方才一篇话，处处论到俄国，是说他革命党的组织，不是说他的革命的主义。
——回答清华学生“国民党施行的，是否俄国的主义？”，1924年2月9日
Close the door. Write with no one looking over your shoulder. Don't try to figure out what other people want to hear from you; figure out what you have to say. It's the one and only thing you have to offer.
True success is living life on your own terms.
The joy of solving a mathematical problem is unparalleled; it is a moment of pure intellectual triumph.