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。
The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used.
释义:不要轻视微小的力量,历史的改变始于个体的觉醒。
The training and improvement of labor are effective ways to increase productivity.
I'm a true believer that if you stay ready, you don't have to get ready.