So far I have been considering people who have innocent minds, within their limitations, and who are amenable to reason. Not all people are like this. And one has to accept the fact (whatever the reason for it) that some people are good, and others bad. Some novelists have suggested that every bad action a man does leaves its mark upon his body, and presumably upon his mind as well. They may be right. Certainly the poet Spenser expressed the same thought more succinctly and more beautifully when he said, “Soul is form and doth the body make”. In other words a good man is manifestly a good man, by looking at his face and body; and a bad man is manifestly a bad man by looking at his face and body, provided one has sufficient experience of human nature to know what to look for, and not to be taken in by superficial charm. However all this is speculation; the important point for the present purpose is that there are men who lie, who cheat, who steal, who blackmail, who murder. And the important question is “Why?”. Not what are men's motives for committing these wrongs, because these are infinite. But what is the mechanism which gives motives such power over men, as to compel them to commit such deeds? You see, if the world and human nature had been constructed differently, it would be…