We've done price elasticity studies, and the answer is always that we should raise prices. We don't do that, because we believe -- and we have to take this as an article of faith -- that by keeping our prices very, very low, we earn trust with customers over time, and that that actually does maximize free cash flow over the long term.

生命太短暂，不能浪费时间恨任何人。

The only way to do great work is to love what you do.

世界上充满了神奇的事物，耐心地等待着我们的感官变得更加敏锐。

The beauty of a mathematical idea is that it can be shared and understood across cultures and time.

每个革命者的责任就是进行革命。