人们在做事时绝不能够拖拉，不能够反复多变，不能够斤斤计较；可是替别人做事时，却特别需要耐得住拖延耽搁，耐得住反复多变，耐得住琐碎烦乱。

A man's errors are his portals of discovery.

The laws of physics are universal, but our understanding of them is constantly evolving.

如果不符合现实，最优雅的理论也是无用的。