生存下来的不是最强壮的,也不是最聪明的,而是最能适应变化的。
It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change.  
I don't think that you have any insight whatsoever into your capacity for good until you have some well-developed insight into your capacity for evil.
让睁眼看着玫瑰花的人也看看它的刺。