When life seems hard, the courageous do not lie down and accept defeat; instead, they are all the more determined to struggle for better future.

人生像一匹马，你不驾驭它，它便驾驭你。

在数学中，提出问题的艺术必须比解决问题更有价值。

存在即是理性。

All violence is the illustration of a pathetic stereotype.