Psychology must be a science of facts, not theories.

If you can dream it, you can do it.

To be free is not to have the power to do anything you want, but to have the power to do what is right.

读书最要紧的就是勤学好问，做人最要紧的就是实实在在而持之以恒。

抽象的目的不是模糊，而是创建一个新的语义层次，在这个层次上可以绝对精确。