过得最充实的人不是年龄最大的，而是经历最丰富的人。

As to the gods, I do not know whether they exist or not, nor what they are like in form; for there are many things that hinder sure knowledge, the obscurity of the matter and the shortness of human life.

孔子说：“将知识默记在心，学习时，不感到满足；教人时，不感到疲倦，对我来说没什么问题。”