最大的智慧是知道自己一无所知。

我认为你永远不能停止学习。总有新的东西等待发现。

The teacher is not in school to impose certain ideas or to form certain habits in the child, but is there as a member of the community to select the influences which shall affect the child and to assist him in properly responding to those influences.

煤炭研究和DNA工作同样重要。