The essence of mathematics lies in its freedom.
If you don't say what you think then you kill your unborn self.
The only existence we conceive is the existence of sensible things.
译文：进入山中不怕那伤人的老虎，只怕人世间两面三刀之人。赏析：世事难测，人心险恶，我们要防范身边那些口是心非，笑里藏刀，口蜜腹剑，阳奉阴违之人。
As long as you have stayed in a swan's egg, it doesn't matter if you were born in a duck yard.