We shall never prevent the abuse of power if we are not prepared to limit power in a way which occasionally may prevent its use for desirable purposes.

The improver of natural knowledge absolutely refuses to acknowledge authority as such.  

我有一个梦想，这个梦想值得我付出一切。

理论计算机科学的美在于它能够抽象并解决看似不可逾越的问题。