天下的老百姓如果都向上统一于天子,而不向上统一于天的意志,那么灾祸就还没有完全离去。
我们要做海洋的守护者,而不是掠夺者。
False facts are highly injurious to the progress of science, for they often endure long.  
The power of mathematics lies in its generality and abstraction.