A way of life and thought which denies or ignores the existence of God is bound to end in dissolution and self-contradiction.
If this is not sufficiently proved by the state of futility to which Humanism and rationalism have brought us, a state of inhumanity and irrationality, all that remains necessary is to reason the matter out.
From the standpoint of reason the conclusion that God exists is unavoidable; to demonstrate this truth was the greatest and perhaps the most permanent achievement of mediaeval philosophy, and in particular of St. Thomas.
The only way to escape this conclusion is to deny the validity of reason, which is merely to make argument, philosophy, and almost every form of discussion and thought impossible.