To describe this viewpoint as controversial greatly understates its tremendous reach. Were it true, it would mean that nearly every scientist in the biological and behavorial sciences, nearly every great poet, dramatist, and novelist, and all great statemen, generals, businessmen, etc. have been wrong; for nearly everyone who has ever studied, described, bargained with, dealt with, or commanded human beings has assumed that man is not a being of self-made soul, that his "soul" (or character) is a product of many factors, and that something called "human nature" most definitely exists and can be used to make generalizations concerning how human beings are likely to react to various incentives.