A well-designed system is one that can evolve over time without requiring significant rework.
一个设计良好的系统是能够随着时间的推移而发展，而不需要大量的返工。
The world is all the richer for having a devil in it, so long as we keep our foot upon his neck.
The pursuit of mathematical knowledge is a never-ending adventure, filled with challenges, surprises, and the satisfaction of solving the unsolvable.
The function of thought is to guide successful behavior.
【大意】把猿猴关在笼子里，它就会像猪一样，并不是它没有灵巧攀登、轻捷跳跃的本领，而是没有它发挥本领的机会。