世界并不是不完美的，也不是在通往完美的道路上缓慢进化。不，它在每一刻都是完美的，每个罪孽已经内含着恩典。

Take long walks in stormy weather or through deep snows in the fields and woods, if you would keep your spirits up. Deal with brute nature. Be cold and hungry and weary.

We do not need magic to transform our world. We carry all the power we need inside ourselves already.

数学的快乐来自于为理解而奋斗。