Every mental state exists for a purpose; to understand it, we must ask what function it serves in the broader system of behavior.
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。
心理学的任务是研究意识的直接经验。
The highest endeavor of the mind， and the highest virtue， is to understand things by intuition.
The only way to achieve the impossible is to believe it is possible.