The probability of a response is determined by its reinforcement history.
关爱别人,这是最为博大的;使别人受益,这是最为深厚的。 
「释义」:坚守志向要像心痛发作,全神贯注在痛处,哪还有心思闲聊多事?
儿童不仅在心理上是被动的,而且像一个空花瓶,是一个有待于充满及塑造的生命。