Nothing is so powerful as an insight into human nature . . . what compulsions drive a man, what instincts dominate his action . . . if you know these things about a man you can touch him at the core of his being.
没有什么比洞察人性更有力量……什么强迫驱使一个人，什么本能支配他的行为……如果你了解一个人的这些事情，你就能触及他的本质。