心智是大脑的功能。

诗歌应当以优美的丰盈而非奇特来使人惊喜——它应当让读者觉得表达了他自己最高尚的思想，几乎像是一种回忆。

In the quest to understand quantum gravity, we are like children playing on the shore of a vast ocean, occasionally finding a smooth pebble or a pretty shell, while the great ocean of truth lies undiscovered before us.

教育者的心必须是一团活生生的火焰，是温暖和光明的源泉。