The motto that Artsybashev has placed at the beginning of the novel is taken from Ecclesiastes vii. 29: "God hath made man upright: but they have sought out many inventions." This same text was used by Kipling as the title of one of his books, but used naturally in a quite different way. The Devil has here cited Scripture for his purpose. The hero of the novel is an absolutely sincere, frank, and courageous Advocatus Diabou. He is invariably calm and collected; he never loses his temper in an argument; he questions the most fundamental beliefs and principles with remorseless logic. Two of his friends are arguing about Christianity; "at least," says one, "you will not deny that its influence has been good." "I don't deny that," says the other. Then Sanin remarks quietly, "But I deny it!" and he adds, with a calmness provoking to the two disputants, "Christianity has played an abominable role in history, and the name of Jesus Christ will for some time yet oppress humanity like a curse." Sanin insists that it is not necessary to have any theory of life, or to be guided by any principle; that God may exist or He may not; He does not at any rate bother about us. The real rational life of man should be exactly like a bird. He should be controlled wholly by the desire of the moment. The bird wishes to alight on a branch, and so he alights; then he wishes to fly, so he flies. That is rational, declares Sanin; that is the way men and women should live, without principles, without plans, and without regrets. Drunkenness and adultery are nothing to be ashamed of, nor in any sense to be called degrading. Nothing that gives pleasure can ever be degrading. The love of strong drink and the lust for woman are not sins; in fact, there is no such thing as sin. These passions are manly and natural, and what is natural cannot be wrong. There is in Sanin's doctrine something of Nietzsche and more of Rousseau.