Happiness is holding someone in your arms and knowing you hold the whole world.

在互联网行业，唯一不变的就是变化本身。

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.

系统对给定输入的响应是其历史记录的函数。

你必须愿意牺牲，投入时间和精力。

All is number.

我不活在过去，我专注于现在和未来。