She realises, like much greater thinkers, how hard it is to understand how our material world can be contained in a spiritual idea, and that Matter and Mind are of difficult reconciliation, although, if we grant they both exist, they are so obviously related that they must be reconcilable within a Unity somehow. This reconciliation has cost much thought for thousands of years on the part of the deepest thinkers, but the easy way of solving the difficulty in the case of shallow thinkers is to do it by throwing one or other of the members in this pair of opposites away, to deny it existence, and so to attain a cheap conception of unity by pronouncing either matter or mind to be a mere illusion. The Materialist tries cancelling Mind. Mrs. Eddy throws out Matter and with it our entire physical world, not only the objects in it, but all mental conceptions in regard to it, such as the Laws of Nature, and all possible theories as to its being a manifestation of Mind. All our conceptions of its laws are errors conceived by the intellect, she teaches,[115] which is itself non-existent. In fact, the world only _is_ because we falsely think it is. We have only to unthink it, and it will disappear. Spirit is One, and therefore the many objects of the world cannot be included in it; and only Spirit is real, therefore the material world cannot be real. Such is her argument, and she cannot allow that Matter may be a manifestation of Mind or created by Mind, or have any relation with it of whatever sort. ‘Spirit and Matter no more commingle,’ she says, ‘than light or darkness,’ and she asserts that ‘Science reveals nothing in Spirit out of which to create Matter.’ [115] For proofs of my assertions regarding the teachings of _Science and Health_, I must refer the reader to my book _The Truth and Error of Christian Science_. We have here attained, if we have attained it, Oneness at the expense of the Many. It is One simply by means of containing nothing, and, in place of the inspiring conception of the true thinker of the Unity as One because it includes the Many harmoniously related within itself--a Unity of infinite richness and fecundity--we have a dead, empty One, misnamed Unity because there is nothing to unite. The worship of such a Oneness, it has well been said, would be the worship of the None. Such an One would be all-exclusive instead of all-inclusive, and be gained by the annihilation of everything, instead of by the inclusion of all within Itself as the vital expression of Itself. In yet another way Mrs. Eddy’s statements concerning Unity contradict themselves. We have seen that in her conception of Unity the whole world, as we know it, has to be evaporated, as it were, into nothingness, and it has been roundly denied that Spirit had anything to do with its creation. Yet the world has to be accounted for, and in the sequel we find that, according to ‘Science and Health,’ it _has_ been created--but by whom or what?