一本伟大的书是那种让你改变的书，它给你带来对生活的新视角和对人类状况的更深理解。

What good is the warmth of summer, without the cold of winter to give it sweetness.

The competitor to be feared is one who never bothers about you at all, but goes on making his own business better all the time.

意识的元素是心理学的基本单位。