Editing The Catholic Church Reacts (section)

===MIND AND MATTER===
The opposition of mind and matter brings us face to face with the great controversy of Dualism and Monism. Are there two forms of being in the universe ultimately and radically distinct? or are they merely diverse phases or aspects of one common underlying substratum? Our experience at all events appears to reveal to us two fundamentally contrasted forms of reality. On the one side, there is facing us matter occupying space, subject to motion, possessed of inertia and resistance permanent indestructible, and seemingly independent of our observation. On the other, there is our own mind, immediately revealing itself to us in simple unextended acts of consciousness, which seem to be born and then annihilated. Through these conscious acts we apprehend the material world. All our knowledge of it is dependent on them, and in the last resort limited by them. By analogy we ascribe to other human organisms minds like our own. A craving to find unity in the seeming multiplicity of experience has led many thinkers to accept a monistic explanation, in which the apparent duality of mind and matter is reduced to a single underlying principle or substratum. Materialism considers matter itself, body material substance, as this principle. For the materialist, mind, feelings, thoughts, and volitions are but "functions" or "aspects" of matter; mental life is an epiphenomenon, a by-product in the working of the Universe, which can in no way interfere with the course of physical changes or modify the movement of any particle of matter in the world; indeed, in strict consistency it should be held that successive mental acts do not influence or condition each other, but that thoughts and volitions are mere incidental appendages of certain nerve processes in the brain; and these latter are determined exclusively and completely by antecedent material processes. In other words, the materialistic theory, when consistently thought out, leads invariably to the startling conclusion that the human mind has had no real influence on the history of the human race.

On the other hand, the idealistic monist denies altogether the existence of any extra-mental, independent material world. So far from mind being a mere aspect or epiphenomenon attached to matter, the material universe is a creation of the mind and entirely dependent on it. Its esse is percipi. It exists only in and for the mind. Our ideas are the only things of which we can be truly certain. And, indeed, if we were compelled to embrace monism, it seems to us there can be little doubt as to the logical superiority of the idealistic position. But there is no philosophical compulsion to adopt either a materialistic or an idealistic monism. The conviction of the common sense of mankind, and the assumption of physical science that there are two orders of being in the universe, mind and matter, distinct from each other yet interacting and influencing each other, and the assurance that the human mind can obtain a limited yet true knowledge of the material world which really exists outside and independently of it occupying a space of three dimensions, this view, which is the common teaching of the Scholastic philosophy and Catholic thinkers, can be abundantly justified (see DUALISM; ENERGY, CONSERVATION OF).