真正的进步发生在我们停止为过去优化，开始为未来建设之时。
True progress happens when we stop optimizing for the past and start building for the future.
制革厂的废物流比任何使命宣言都更清晰地讲述其道德故事。
打开纠缠在一起的绳结的最好方法，不是要去「解开」绳结，而是要不断地把松动的部分拉得更宽。尽可能把那团乱麻弄大、弄松、弄开。当你打开绳结的时候，它们就会自行解开。这招适用于绳索、线、软管、毛线或者电线。
The best way to untangle a knotty tangle is not to “untie” the knots， but to keep pulling the loops apart wider and wider. Just make the mess as big， loose and open as possible. As you open up the knots they will unravel themselves. Works on cords， strings， hoses， yarns， or electronic cables.
I think it's important to be able to take yourself lightly.
The unity of mathematics is not an illusion but a reality waiting to be uncovered.
目标是给每个人一个声音，并帮助为未来改造社会。
数学是逻辑思想的诗歌。