The only person you should try to be better than is the person you were yesterday.

最伟大的艺术存在于生活中最简单的时刻。

One can't proceed from the informal to the formal by formal means.

小人专门期望他人的恩惠，但受恩后就忘；君子则不轻易受人恩惠，若受恩于人，则必定想法图报。