One does not ask of one who suffers: What is your country and what is your religion? One merely says: You suffer, that is enough for me.

To do mathematics is to explore a universe of ideas, where the only limit is your imagination.

我不让错误让我灰心，我让它们教育我。

难以消化的美味，不要贪吃；难以获取的宝物，不要储藏；难以酬报的恩惠，不要接受；难以久处的朋友，不要交往；难以再现的光陰，不要失去；难以守护的资财，不要积贮；难以辩明的诽谤，不要辩白；难以解除的忿恨，不要计较。