Few philosophical controversies have been waged with greater acrimony than the controversy between the libertarians and the determinists; the vigour with which both sides of the question have been espoused is due not only to the metaphysical importance of the issue—which is indeed considerable—but more especially to its moral and religious implications. No other philosophical issues, with the exception of those pertaining to God and the immortality of the soul, are of greater ethical and theological moment. So thoroughly has the question been debated that further consideration of it may seem futile. Has not the evidence been so completely canvassed on both sides of the controversy that further discussion will be a fruitless reiteration of long familiar arguments? The free-will problem is considered by many contemporary thinkers an admittedly unsolved but completely outmoded problem to which they respond with impatience or complete indifference. This attitude toward the problem is quite indefensible since the question of the freedom of the will is one of those perennially significant philosophical issues which takes on new meaning in every age and is particularly significant in the context of contemporary science and philosophy. Recent psychology, in large measure through the influence of Freud, has achieved a more penetrating analysis of human motivation by bringing to the fore certain hitherto obscure factors which are operative in volition. The psychology of the subconscious by filling in apparent gaps in the psychological causation of volition has furthered the case for determinism.