客人来了，主人不去招呼，他可能是个不知事理的傻子。

Language is a process of free creation; its laws and principles are fixed, but the manner in which the principles of generation are used is free and infinitely varied.

Every moment is a fresh beginning.

要理解未来，首先必须理解过去。

成功来自于努力工作、远见和适应能力的结合。