系统有子系统，子系统有子系统，等等，这是无限的，这就是为什么我们总是从头开始。
No man is useless in this world who lightens the burden of someone else.
The best way to learn mathematics is to do mathematics.
The mind is a system of organs of computation, designed by natural selection to solve the kinds of problems our ancestors faced in their foraging way of life.
总是去信任他人身上的闪光点，因为看到他人闪光点且信任的人，也常收获他人对你的好。偶尔被骗只是伴随的小代价。