Extraordinary claims should require extraordinary evidence to be believed.
Purposive behavior in animals and men.
促使人们倾向于和平的激情是对死亡的恐惧,对舒适生活必需品的渴望,以及通过自己的努力获得这些的希望。
I'm not afraid to be alone; I'm afraid of being lonely.
The world is full of suffering, but it is also full of the overcoming of it.
Psychology must be based on observable facts, not speculation.