To do mathematics is to engage in an act of discovery and conjecture, intuition and inspiration.

Investors should focus on the long-term and not be swayed by short-term market fluctuations.

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.

可持续发展对我们来说不仅仅是一个流行词，它是我们运营的基础。