In mathematics, you don't understand things. You just get used to them.
二十世纪最后二十五年最显著的发展是世界看似强大的独裁政权核心的巨大弱点被揭示。
Freedom would be not to choose between black and white but to abjure such prescribed choices.
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.