当你对别人说“是”时，确保你没有对自己说“不”。

Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties. And not to Democrats alone do I make this appeal, but to all who love these great and true principles.

我不是悲观主义者，我是一个受过悲观主义训练的乐观主义者。

在数学中，你并不理解事物。你只是习惯了它们。