天地没有偏爱，对待万物像对待草扎的狗一样，任其自生自灭。

不要说不利于身心的话，不要做不利于身心的事，不要接近不利于身心的人，不要进入不利于身心的境界，不要看不利于身心的书。

The mother-child relationship is paradoxical and, in a sense, tragic. It requires the most intense love on the mother's side, yet this very love must help the child grow away from the mother, and to become fully independent.

真相很少纯粹，也绝不简单。

Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.