The more a person limits himself, the more resourceful he becomes.
Kindness is a language that the deaf can hear and the blind can see.
经济进步既依赖于新想法，也依赖于更好的实施。
In mathematics, you don't understand things. You just get used to them.
孔子说：“遇到可以说的人却不说，就会失去可与说话的人；遇到不可说的人却说了，就是说话冒失。聪明的人既不去可交谈的人，也不言谈冒失。”