自由不是选择黑白，而是放弃这种规定的选择。

You never fail until you stop trying.

In mathematics, the art of proposing a question must be held of higher value than solving it.

Reality is a question of perspective; the further you get from the past, the more concrete and plausible it seems.

A thief is a poor man's best friend.

自私是永远存在的。