历史学家必须怀有一种信念：人类不会也不能灭亡。

如果你愿意，错误地思考，但在所有情况下，为自己思考。

君子可以去救人，却不可陷进去；可以受欺骗，却不可以盲目行动。

The chief beauty about time is that you cannot waste it in advance. The next year, the next day, the next hour are lying ready for you, as perfect, as unspoiled, as if you had never wasted or misapplied a single moment in all your life. You can turn over a new leaf every hour if you choose.