生活的美在于它的不可预测性；正是这一点让它值得活下去。

创新的关键不仅在于找到答案，还在于提出正确的问题。

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.