我们教授一门学科不是为了培养关于该学科的小型活图书馆,而是让学生自己学会数学思考。
The worst thing in the world that can happen to you if you’re an engineer that has given his life to develop something is for someone to just rip it off.
——在遗嘱上签名后,对在病榻的同志们说,1925年3月11日