Darkness cannot drive out darkness； only light can do that.Hate cannot drive out hate； only love can do that.

I never want to look back and say I could have done more.

数学家是能在定理之间找到类比的人；更好的数学家是能在证明之间看到类比的人；而最好的数学家是能注意到理论之间类比的人。

The way we see things is affected by what we know or what we believe.

Poverty is not just a lack of money; it’s about having so little that you can’t even afford to make the right decisions.

平均射击是你完成高于平均水平的最佳机会。

"The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter."