The modern "principle" is too often only a new form of the ancient taboo, rather than an enlightened rule of conduct. The person who justifies himself by saying that he holds certain beliefs, or acts in a certain manner "on principle", and yet refuses to examine the basis and expediency of his principle, introduces into his thinking and conduct an irrational, mystical element similar to that which characterized savage prohibitions. Principles unintelligently urged make a great deal of trouble in the free consideration of social readjustment, for they are frequently as recalcitrant and obscurantist as the primitive taboo, and are really scarcely more than an excuse for refusing to reconsider one's convictions and conduct. The psychological conditions lying back of both taboo and this sort of principle are essentially the same. We find in savage thought a sort of intensified and generalized taboo in the classification of things as clean and unclean and in the conceptions of the sacred. These are really expressions of profound and persistent traits in the uncritical mind and can only be overcome by carefully cultivated criticism. They are the result of our natural timidity and the constant dread lest we find ourselves treading on holy (_i. e._, dangerous) ground.[17] When they are intrenched in the mind we cannot expect to think freely and fairly, for they effectually stop argument. If a thing is held to be sacred it is the center of what may be called a defense complex, and a reasonable consideration of the merits of the case will not be tolerated. When an issue is declared to be a "moral" one--for example, the prohibition of strong drink--an emotional state is implied which makes reasonable compromise and adjustment impossible; for "moral" is a word on somewhat the same plane as "sacred", and has much the same qualities and similar effects on thinking. In dealing with the relations of the sexes the terms "pure" and "impure" introduce mystic and irrational moods alien to clear analysis and reasonable readjustments. Those who have studied the characteristics of savage life are always struck by its deadly conservatism, its needless restraints on the freedom of the individual, and its hopeless routine. Man, like plants and animals in general, tends to go on from generation to generation, living as nearly as may be the life of his forbears. Changes have to be forced upon him by hard experience, and he is ever prone to find excuses for slipping back into older habits, for these are likely to be simpler, less critical, more spontaneous--more closely akin, in short, to his animal and primitive promptings. One who prides himself to-day on his conservatism, on the ground that man is naturally an anarchic and disorderly creature who is held in check by the far-seeing Tory, is almost exactly reversing the truth. Mankind is conservative by nature and readily generates restraints on himself and obstacles to change