世界上最好和最美丽的东西是看不见甚至摸不到的——它们必须用心去感受。

The strength of a response tendency depends on the amount of reinforcement received.

人类是一种非常奇特的生物。他以为自己有一个灵魂，其实他有几十个。

History is a cyclic poem written by time upon the memories of man.

The true art of memory is the art of attention.

死亡终将是尽头，但生活充满了无限的可能。