True innovation comes from curiosity and the courage to challenge the unknown.
学习本质上是刺激-反应连接的问题。
胜利的时刻太短暂，不能只为那一刻而活。
The natural effort of every individual to better his own condition， when suffered to exert itself with freedom and security， is so powerful a principle that it is alone， and without any assistance， not only capable of carrying on the society to wealth and prosperity but of surmounting a hundred impertinent obstructions with which the folly of human laws too often encumbers its operations.