Religion has been with us for all the period that we know anything about man, for the very cave man buried his dead with manifest confidence in a hereafter, and there seems no doubt that it will be with us until this stage of mundane affairs has passed. It affects the body as well as the mind, as indeed do all the great modes of thought, and it deserves to be cultivated, not only for its effect on the soul but also on the mind and heart and the bodily powers. There is no doubt at all that it means very much, and there is only the question of facing its significance for the whole man candidly and straightforwardly. {8} CHAPTER I CAN WE STILL BELIEVE? There is no doubt that man's quite instinctive attitude toward the mystery which surrounds him, out of which he came and into which he goes, has always so influenced his attitude of mind toward his body and its processes as to affect them deeply. The medicine man with his appeal to the religious as well as the superstitious feelings of man always had a potent influence over the most primitive of mankind, but culture has not obliterated this source of special reaction in men. Even now, for the great majority of men it still remains true that no matter how vague their religious instinct may be, it continues to affect, to a notable extent, their physiological and psychological functions. An eclipse of the religious instinct is at the basis of the increase in suicide and also undoubtedly of insanity in our day. The lack of an abiding faith in Providence is the source of many dreads and worries that affect health. Every physician is sure to know of highly educated patients whose ills reflect their mental relation to the mystery of life and whose symptoms take on or lose significance, according to their religious feelings. The question that in our time, however, is coming insistently into a great many minds is, Can we, as intelligent human beings, reasonably in touch with man's recent progress in science, be fair with ourselves and still continue {9} to believe in the great religious truths that affected our ancestors so deeply? While we may realize all the depth of the mystery in the midst of which we are, can we, with our little minds, hope to fathom any of it? This is the questioning feeling that will not down for a certain number of those who have had educational advantages. Must we not just confess our inability to, know anything definite in reality with regard to it, and feel that those who have thought that they held the key of the mystery were deluding themselves or allowing themselves to be caught by pseudo-knowledge, an inheritance from unthinking generations, instead of realities?