I don't care what others say, only what I do.

The past is not for living in; it is a well of conclusions from which we draw in order to act.

Leadership is about making the tough decisions when they matter most.

要理解心灵，就要研究它在现实生活中的运作。

Immediately pay what you owe to vendors， workers， contractors. They will go out of their way to work with you first next time.

臣民对主权者的义务，只要主权者能保护他们，就持续存在，否则就不再存在。

我想：丹中尉发现，有些事你是无法改变的，他不想被称为残废，就象我不想被称为傻瓜。

数学的美在于它允许我们从物理世界中抽象出来，专注于基本原理。