"The past is a candle at great distance: too close to let you quit, too far to comfort you."

我旅行得越多，就越确信世界充满了奇迹，而人类只是大自然浩瀚中的一粒尘埃。

教授数学是为了激励下一代的思考者和问题解决者。

The best stock to buy is the one you already own.