淡泊平静，忧患就不能影响，邪气就不能侵袭，就德性完备而精神不损。
Mathematics is the art of giving the same name to different things.
记忆是我们随身携带的日记。
The man who is anybody and who does anything is surely going to be criticized, vilified, and misunderstood. This is part of the penalty for greatness, and every great man understands it.
The world is a machine, and we are its broken parts.
The first step in the art of cutting metals is to find a man who has the necessary skill and experience to do the work.
