The probability of a response is determined by its reinforcement history.

Human capital is the most important asset any country has.

A leader's job is not to do the work for others, but to help others figure out how to do it themselves.

我一直在不停地努力，不嘲笑、不哀叹、不嘲笑人类的行为，而是理解它们。

一个观念的价值在于它的实际后果。