如果你不坚持某些东西，你就会为任何事屈服。

Virtues are acquired through endeavor, which rests wholly upon yourself.

Insight is the sudden comprehension of the relations among the parts of a problem.

There are no objects whose existence is indubitable.

每种心理状态都有其存在的目的；要理解它，我们必须询问它在更广泛的行为系统中发挥什么功能。

艺术的意义不是固定的，它随着观众而演变。