In mathematics, you don't understand things. You just get used to them.
The right of a nation to kill a tyrant in case of necessity can never be doubted until the right of a tyrant to kill a nation has been proved.
任何圆的面积等于一个直角三角形,其中一条直角边等于半径,另一条等于圆的周长。
生活中唯一的限制是你给自己设定的。
The stories we tell ourselves are just as important as the stories told about us.