You'll never have a quiet world till you knock the patriotism out of the human race.
数学不是一项观赏性运动。
To know that one does not write for the other, to know that these things I am going to write will never make me loved by the one I love.
Don’t be afraid to ask a question that may sound stupid because 99% of the time everyone else is thinking of the same question and is too embarrassed to ask it.