Give me a dozen healthy infants, well-formed, and my own specified world to bring them up in and I'll guarantee to take any one at random and train him to become any type of specialist I might select—doctor, lawyer, artist, merchant-chief and, yes, even beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations, and race of his ancestors.

性能的关键在于优雅，而不是大量的特殊情况。

人心容易偏离正道，道心微妙难明，只有精研专一，才能持守中道。