历史进程是不连续的,重大变革往往是突然发生的,而不是渐进的。
A mathematician's work is never done; there are always more problems to solve.
人は、誰かを守りたいと思ったとき、本当の強さを発揮する。
It is to the credit of human nature, that, except where its selfishness is brought into play, it loves more readily than it hates.