心理学家必须研究心灵的实际状态，而非理想状态。

知识的每一次进步都会带来新的问题和新的困难。

The natural price of labor is that price which is necessary to enable the laborers, one with another, to subsist and to perpetuate their race, without either increase or diminution.

在一个无意义的世界里，追求快乐是唯一有意义的活动。

The real struggle is not between good and evil but between pain and pleasure.

"Children deserve books that challenge them, not just entertain."

The challenge in auction theory is to balance simplicity with strategic sophistication.

第二名只能说明你是头号输家。