人情像纸一样十分脆薄，世界上的事如棋局一样变化万千。

Give the pupils something to do, not something to learn; and the doing is of such a nature as to demand thinking; learning naturally results.

I believe in the power of love and kindness.

UNIX is very simple, it just needs a genius to understand its simplicity.

The dead have given us the gift of their genetic legacy.