孔子说：“外表威严而内心怯懦的人，用小人作比喻，就象挖墙洞的小偷吧！”

教学不是传递知识，而是为知识的产生或构建创造可能性。

The roots of education are bitter, but the fruit is sweet.

If you're not failing occasionally, you're not pushing boundaries hard enough.