数学家研究纯数学不是因为它有用；他研究它是因为他喜欢它，他喜欢它是因为它美丽。

The farmer is the only man in our economy who buys everything at retail, sells everything at wholesale, and pays the freight both ways.

Thought and behavior are inseparable in the living organism.

故事的力量在于它能够激发行动。

有时最难的并非放手，而是学会重新开始。