一般来说，嫉妒、怨恨和自怜都是灾难性的思想模式。自怨自艾与偏执狂相当接近，而偏执狂是最难扭转的。

When you get an invitation to do something in the future， ask yourself: would you accept this if it was scheduled for tomorrow？ Not too many promises will pass that immediacy filter.

Every mathematical problem has a solution; sometimes it just takes time to find it.

可持续性已不再是选择，而是我们对后代的责任。