数学家研究纯数学不是因为它有用；他研究它是因为他喜欢它，他喜欢它是因为它美丽。
The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.
"The best way to predict the future is to create it."
经济学的研究最终是对人类行为及其后果的研究。
The best leaders are those who listen more than they speak.
To study the mind is to study adaptation in action; every thought is a tool for living.