The people who are crazy enough to think they can change the world are the ones who do.

商场如战场，防人之心不可无。  

Je suis l’Empire à la fin de la décadence.

We cannot know the cause, and therefore the effect, by reason alone.

翻译：所以不完全了解用兵的危害，就不能完全了解用兵的好处。