At this point in our argument it is advisable to glance backward over the way we have come; because the reality of this "eternal vision" depends, more than has as yet been understood, upon our whole attitude to the mystery of personality, and to the place of personality, as the secret of the world. The feeling which we have about the emotion of love, as if it were a thing pouring through us from some unfathomable depth, does not imply that "the invisible companions" are themselves that depth. The "invisible companions" are not in any sense connected with the conception of an "over-soul." That "depth," from which the power of creative love pours forth, is not the "depth" of any "over-soul" but is the depth of our own unfathomable nature. The introduction of "something behind the universe," the introduction of some "parent" or "first cause" of the universe, from which we have to suppose this secret of love as emerging, is as unnecessary as it is unbeautiful. It does nothing but fling the mystery one step further back without in the least elucidating it; and in thus throwing it back it thins it out and cheapens it. There is nothing which appeals to the aesthetic sense about this hypothesis of an "over-soul" from whose universal being the ideas of beauty and truth and goodness may be supposed to proceed. It is a clumsy and crude speculation, easy to be grasped by the superficial mind, and with an air of profundity which is entirely deceptive. So far from being a spiritual conception, this conception of an over-soul, existing just behind the material universe and pouring forth indiscriminately its "truth," "beauty," "nobility" and "love," is an entirely materialistic one. It is a clumsy and crude metaphor or analogy drawn from the objective world and projected into that region of sheer unfathomableness which lies beyond human thought. When the conception of the over-soul is submitted to analysis it is found to consist of nothing else than vague images drawn from material sensation. We think of the world for instance as a vast porous sponge continually penetrated by a flood of water or air or vapour drawn from some hidden cistern or reservoir or cosmic lake. The modern theological expression "immanent" has done harm in this direction. There is nothing profound about this conception of "immanence." It is an entirely materialistic conception drawn from sense analogy. The same criticism applies to much of the vague speculation which is usually called "mysticism." Mysticism is not a spiritual attitude. It is often no more than the expression of thwarted sex-desire directed towards the universe instead of towards the person who has repulsed it. The basic motive of mysticism, although in the highest cases it springs from intuition, is very often only an extension into the unknown of physiological misery or of physiological well-being.