51. OPTIMISM AND PESSIMISM.—Those few outlines of the philosophy of theism—theses established in Natural Theology—will reveal to us the place of theism in relation to “optimist” and “pessimist” systems of philosophy. Pessimism, as an outcome of philosophical speculation, is the proclamation in some form or other of the conviction that human existence, nay, existence in general, is a failure, an evil. It is the analogue, in relation to will, of what scepticism is in relation to intellect; and it is no less self-contradictory than the latter. While the latter points to total paralysis of thought, the former involves a like paralysis of all will, all effort, all purpose in existence—a philosophy of despair, despondency, gloom. Both are equally erroneous, equally indicative of philosophical failure, equally repugnant to the normal, healthy mind. Optimism on the other hand is expressive of the conviction that good predominates in all existence: _melius est esse quam non esse_; that at the root of all reality there is a beneficent purpose which is ever being realized; that there is in things not merely a truth that can be known but a goodness that can be loved. Existence is not an evil, life is not a failure. This is a philosophy of hope, buoyancy, effort and attainment. But is it true, or is it an empty illusion? Well, to maintain that the actual universe is the best absolutely, would, of course, be absurd. If Leibniz’s “Principle of Sufficient Reason” obliged him to contend, in face of the painfully palpable facts of physical and moral evil in the universe, that this universe is the best absolutely possible, the best that God could create, we can only say: so much the worse for his “Principle”. The true optimism is that of the theist who, admitting the prevalence of evil in the universe, in the sense to be explained presently, at the same time holds that throughout creation the good predominates, that God’s beneficent purpose in regard to individuals does in the main prevail, and that His glory is manifested in giving to rational creatures the perfection and felicity of knowing and loving Himself. For the theist, then, the problem of the existence of evil in the universe assumes the general form of reconciling the fact of evil in God’s creation with the fact of God’s infinite power and goodness. This is a problem for Natural Theology. Here we have merely to indicate some general principles arising from the consideration of evil as the correlative and antithesis of goodness. 52. EVIL: ITS NATURE AND CAUSES. MANICHEISM.—Admitting the existence of evil in the universe, the scholastic apparently withdraws the admission forthwith by denying the reality of evil. The paradox explains itself by comparing the notions of good and evil, and thus trying to arrive at a proper conception of the latter.