找到可能性的极限的唯一方法就是超越它们进入不可能。

心理学必须基于可观察的现象，而非抽象。

幸福不是现成品，它来自你自己的行动。

I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them.

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

The important thing in life is not the triumph but the struggle.