To be without some of the things you want is an indispensable part of happiness.

I am not the richest person, but I am the happiest person.

It is not the computer's fault that Maxwell's equations are not adequate to design the electric motor.

任何艺术的最大问题都是创造一种存在感。

智慧是对痛苦的理解，对喜悦的感激，以及对过去的接受。