世界不是模型，模型只是模型。
不要让恐惧阻止你追求梦想。
反馈是一个强大的概念，在自然系统和技术系统中被广泛使用。
The true measure of a man is how he treats someone who can do him absolutely no good.
Success is not final, failure is not fatal: it is the courage to continue that counts.
I would not dare to say that there is a direct relation between mathematics and madness, but there is no doubt that great mathematicians suffer from maniacal characteristics.