Take again the case of morality and religion. Because science, by its theory of evolution, appears to be in a fair way of explaining the genesis of these things by natural causes, theists are taking alarm; it is felt by them that if morality can be fully explained by utility, and religion by superstition, the reality of both is destroyed. But Monism teaches that such a view is entirely erroneous. For, according to Monism, the natural causation of morality and religion has nothing whatever to do with the ultimate truth of either. The natural causation is merely a record of physical processes, serving to manifest the psychical processes. Nor can it make any difference, as regards the ultimate veracity of the moral and religious feelings, that they have been developed slowly by natural causes; that they were at first grossly selfish on the one hand, and hideously superstitious on the other; that they afterwards went through a long series of changes, none of which therefore can have fully corresponded with external truth; or that even now they may be both extremely far from any such correspondence. All that such considerations go to prove is, that it belongs to the natural method of mental evolution in man that with advancing culture his ejective interpretations of Nature should more and more nearly _approximate_ the truth. The world-eject must necessarily vary with the character of the human subject; but this does not prove that the ejective interpretation has throughout been wrong in _method_: it only proves that such interpretation has been imperfect--and necessarily imperfect--in _application_. Such, then, I conceive to be one of the most important consequences of the monistic theory. Namely, that by regarding physical causation as everywhere but the objective or phenomenal aspect of an ejective or ontological reality, it furnishes a logical basis for a theory of things which is at the same time natural and spiritual. On the objective aspect, the explanations furnished by reason are of necessity physical, while, on the ejective aspect, such explanations are of necessity metaphysical--or rather, let us say, hyper-physical. But these two orders of explanation are different only because their modes of interpreting the same events are different. The objective explanation which was given (as we supposed) by Helmholtz of the effects produced on the human brain by hearing a sonata, was no doubt perfectly sound within its own category; but the ejective explanation of these same effects which is given by a musician is equally sound within _its_ category. And similarly, if instead of the man-object we contemplate the world-object physical causation becomes but the phenomenal aspect of psychical causation; the invariability of its sequence becomes but the expression of intentional order; the iron rigidity of natural law becomes the sensuous manifestation of an unalterable consistency as belonging to the Supreme Volition.