A proof is a way to convince yourself and others that something is true.

让人获得自由是艺术的目的。

The purpose of a habit is to remove that action from self-negotiation. You no longer expend energy deciding whether to do it. You just do it. Good habits can range from telling the truth， to flossing

All businesses need to be young forever. If your customer base ages with you， you're Woolworth's.

有时候当你创新时，你会犯错。最好迅速承认错误，然后继续改进你的其他创新。