Our frustration is greater when we have much and want more than when we have nothing and want some. We are less dissatisfied when we lack many things than when we seem to lack but one thing.

The past is not a prison but a springboard.

A liberdade é um bem que não tem preço.

未来不是命中注定的。没有保证。所以，要主动承担成年人的责任。要有目的性。开始工作。选择你的家庭。做数学题。创造你自己的确定性。不要被你不知道或没做的事情所定义。

The past is a foreign country; they do things differently there.

P与NP问题是计算机科学中最重要的一个问题之一。