牛马生着四足，这是天性；给马戴上笼头，给牛穿上鼻绳，就是人为。所以说，不要人为毁灭天性，不要用故意造作去毁灭天命，不要以德行去为名利殉葬，谨守天道勿使丧失，这就叫返归本真。

宇宙学家经常犯错，但从不怀疑。

The ratio of positive to negative emotions that predicts flourishing is about 3 to 1. Above that ratio, people tend to flourish; below it, they tend to languish.

To be the best, you must be able to handle the worst.