Here, as it seems to me, is a point at which the old thoughts of religion and the new thoughts of psychology may unite and complete one another.  Here the scientific conception of the psyche is merely restating the fundamental Christian paradox, that man is truly one, a living, growing spirit, the creature and child of the Divine Life; and yet that there seem to be in him, as it were, two antagonistic natures—­that duality which St. Paul calls the old Adam and the new Adam.  The law of the flesh and the law of the spirit, the earthward-tending life of mere natural impulse and the quickening life of re-directed desire, the natural and the spiritual man, are conceptions which the new psychologist can hardly reject or despise.  True, religion and psychology may offer different rationalizations of the facts.  That which one calls original sin, the other calls the instinctive mind:  but the situation each puts before us is the same.  “I find a law,” says St. Paul, “that when I would do good evil is present with me.  For I delight in the law of God after the inward man but I see another law in my members warring against the law of my mind....  With the mind I myself serve the law of God, but with the flesh the law of sin.”  Without going so far as a distinguished psychoanalyst who said in my hearing, “If St. Paul had come to me, I feel I could have helped him,” I think it is clear that we are learning to give a new content to this, and many other sayings of the New Testament.  More and more psychology tends to emphasize the Pauline distinction; demonstrating that the profound disharmony existing in most civilized men between the impulsive and the rational life, the many conflicts which sap his energy, arise from the persistence within us of the archaic and primitive alongside the modern mind.  It demonstrates that the many stages and constituents of our psychic past are still active in each one of us; though often below the threshold of consciousness.  The blindly instinctive life, with its almost exclusive interests in food, safety and reproduction; the law of the flesh in its simplest form, carried over from our pre-human ancestry and still capable of taking charge when we are off our guard.  The more complex life of the human primitive; with its outlook of wonder, self-interest and fear, developed under conditions of ignorance, peril and perpetual struggle for life.  The history of primitive man covers millions of years:  the history of civilized man, a few thousand at the most.  Therefore it is not surprising that the primitive outlook should have bitten hard into the plastic stuff of the developing psyche, and forms still the infantile foundation of our mental life.  Finally, there is the rational life, so far as the rational is yet achieved by us; correcting, conflicting with, and seeking to refine and control the vigour of primitive impulse.