What's terrible is to pretend that second-rate is first-rate. To pretend that you don't need love when you do; or you like your work when you know quite well you're capable of better.

Sustainability isn't a buzzword—it's a responsibility we owe to future generations.

Mathematics is the art of giving the same name to different things.

天下都变成了秋天的气象，一个房间难以维持春天的温暖。