The past is a shadow that follows us, always present, always haunting.

对认知的研究需要经验方法和理论方法的结合。

我了解到你无法控制生活中的一切，这没关系。

——晚年访谈

The footsteps of Nature are to be traced, not only in her ordinary course, but when she deviates from it in her most extravagant excursions.

最大的胜利来自最艰难的战斗之后。

Never stop learning because the world never stops changing.