The only fence against the world is a thorough knowledge of it.
思考是智力的劳动,梦想是智力的欢愉。
The fabric of reality is woven with the threads of mathematics and observation.
真正的英雄是那些即使害怕也坚持战斗的人。
Train people well enough so they can leave, treat them well enough so they don't want to.