In another respect the theistic proof is exceedingly complex and comprehensive. It takes up into itself, as it were, the entire wealth of human nature. The mind can only rise to the apprehension of God by a process which involves all that is most essential in its own constitution. Thus the will is presupposed. Theistic inference clearly involves the principle of causality. God can only be thought of in the properly theistic sense as the cause of which the universe is the effect. But to think of God as a cause--to apprehend the universe as an effect,--we must have some immediate and direct experience of causation. And such experience we have only in the consciousness of volition. When the soul wills, it knows itself as an agent, as a cause. This is the first knowledge of causation which the mind requires, and the most perfect knowledge thereof which it ever requires. It is a knowledge which sheds light over all the regions of experience subsequently brought under the principle of causality, which accompanies the reason in its upward search until it rests in the cognition of an ultimate cause, and which enables us to think of that cause as the primary, all-originating will. If we did not know ourselves as causes, we could not know God as a cause; and we know ourselves as causes only in so far as we know ourselves as wills. But the principle of causality alone or by itself is quite insufficient to lead the mind up to the apprehension of Deity; and an immediate and direct consciousness of far more within us than will is required to make that apprehension possible. The evidences of intelligence must be combined with the evidences of power before we can be warranted to infer more from the facts of the universe than the existence of an ultimate force; and no mere force, however great or wonderful, is worthy to be called God. God is not only the ultimate Cause, but the Supreme Intelligence; and as it is only in virtue of the direct consciousness of our volitions that we can think of God as a cause, so is it only in virtue of the direct consciousness of our intellectual operations that we can think of Him as an intelligence. It is not from the mere occurrence of a change, or the mere existence of a derivative phenomenon, that we infer the change or phenomenon to be due to an intelligent cause, but from the mode of the occurrence or the character of the phenomenon being such that any cause but an intelligent cause must be deemed an insufficient cause. The inference supposes, however, that we already have some knowledge of what an intelligent cause is--that we have enough of knowledge of the nature of intelligence to convince us that it alone can fully account for order, law, and adjustment. Whence do we get this knowledge? We have not far to seek it; it is inherent in self-consciousness. We know ourselves as intelligences, as beings that foresee and contrive, that can discover and apply principles, that can originate order and adjustment. It is