The inevitableness of this act of faith may be perhaps more vividly realized when we remember that it includes in its revelation the objective reality of our own physical body. Our evidence for the real outward existence of our own body is no surer and no more secure than our evidence for the outward existence of other "bodies." They stand or fall together. If the universe is an illusion then our own physical body is an illusion also. And precisely as the "stuff" out of which the universe is made may be named "energy" or "ether" or "force" or "electricity," rather than "matter," so also the "stuff" out of which the body is made may be named by any scientific term we please. The term used is of no importance as long as the thing represented by it is accepted as a permanent reality. We are now able to advance a step further in regard to the revelation of the complex vision. Granting, as we are compelled to grant, that the other "souls" in the universe possess, each of them, its own "vision" of this same universe; and assuming that each "vision" is so coloured by the individuality of the "visionary" as to be, in a measure, different from all the rest, it becomes obvious that in a very important sense there is not only one universe, but many universes. These many universes, however, are "caused," or evoked, or created, or discovered, by the encounter of various individual souls with that one "objective mystery" which confronts them all. What a naive confession it is of the limitation of the human mind that we should be driven, after all our struggles to articulate the secret of life, to accept, as our final estimate of such a secret just the mysterious "something" which is the substratum of our own soul, confronted by that other mysterious "something" which is the substratum of all possible universes! With the complex vision's revelation that the objective universe really exists comes the parallel revelation that time and space really exist. Here, for the third time, are we faced with critical protests from the isolated activity of the logical reason. Metaphysic reduces both time and space to categories of the mind. Mathematical speculation hints at the existence of some mysterious fourth-dimensional space. Bergsonian dialectic regards ordinary "spatial" time as an inferior category; and finds the real movement of life in a species of time called "duration," which can only be detected by the interior feeling of intuition.