"The nearer the union approaches the extreme physical boundary, the more it kindles the physical passions and desires, and the less satisfaction it gets; the nearer it approaches the opposite extreme spiritual boundary, the less new passions are excited and the greater is the satisfaction. The nearer it is to the first, the more destructive it is to animal energy; the nearer it approaches the second, the spiritual, the more serene, the more enjoyable and forceful is the general condition. * * * Taking into consideration the varying conditions of temperament, and above all what the contracting parties regard as good, proper, and desirable, marriage for some will approach the spiritual union, and for others the physical; but the nearer the union approaches the spiritual the more complete will be the satisfaction. The substance of what has been said is this: that the relation between the sexes have two functions, i. e., the reproductive, and the affectional; and that the sexual energy, if only it have no conscious desire to beget children, must be always directed in the way of affection and love. The manifestation which this energy assumes depends upon custom or reason; the gradual bringing of the reason into accord with the principles herein expounded, and a gradual reorganization of customs consonant with them, results in saving men from many of their passions, and giving them satisfaction for their higher sexual instincts and desires." Some capable writers on the subject have held that in the practice of the methods of semi-continence, such as have been referred to in the foregoing pages of this part of the book, there may lie the danger of excessive stimulation of the sexual centres, without the safety-valve of the physical and nervous relief which follows as a natural sequence in the ordinary sexual relations. The advocates of these methods, however, reply that such objections while valid in the case of persons who practice the same only because opportunity prevents the performance of the usual physical relation, still have no true application to those who adopt these methods in a conscientious and honest manner, and who maintain THE PROPER MENTAL ATTITUDE toward the whole question.