人心是一个谜，甚至对它自己也是如此。
书是一面镜子：如果一头驴往里看，你不能指望看到一位使徒。
What excites me most is the potential for basic science to transform medicine.
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.