I can't find a friend who is totally devoted to me, and I have to be able to overcome the inertia of my friend by the force of it.
我既找不到一个完全献身于我的朋友，我就必须有些能以其推动力克服我的惰性的朋友。
A teacher who is attempting to teach without inspiring the pupil with a desire to learn is hammering on cold iron.
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。