In mathematics, truth is always relative to the system you're working in.
人们为了保护自己不受伤害,会伤害他人。
永远不要停止学习,因为生活永远不会停止教导。
有时候最有力的时刻是那些未说出口的时刻。
未来属于那些相信自己梦想之美的人。
The only way to learn mathematics is to do mathematics.
The only fence against the world is a thorough knowledge of it.