这样确切的爱，一生只有一次。

The mathematician's best work is art, a high perfect art, as daring as the most secret dreams of imagination, clear and limpid.

你的梦想是有效的，追逐它们。

If you don't say what you think then you kill your unborn self.

Every challenge is an opportunity to learn something new about yourself.

 Instead of complaining about the darkness, light a candle.