Mathematics is not a spectator sport. You have to do it to understand it.
数学不是一项观赏性运动。你必须亲自去做才能理解它。
我不擅长生活，但我擅长音乐。
The only thing I'm interested in is seeing. Not in having seen, but in seeing itself.
《三民主义.民生主义》（1924年8月10日）
Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.
实现明天的唯一限制将是我们今天的疑虑。