It might be argued that Bergson's monistic "spirit," functioning in a mysterious indefinable "time," demands neither more nor less of an irrational act of faith than our mysterious psycho-material "soul" surrounded by a mysterious hyper-chemical "medium" and creating its future out of an inexplicable "objective mystery."
Where however the philosophy of the complex vision has the advantage over the philosophy of the "élan vital" is in the fact that even on Bergson's own admission what the human consciousness most intensely knows is not "pure spirit," whether shaped like a fan or shaped like a sheaf, but simply its own integral identity. And this integral identity of consciousness can only be visualized or felt in the mind itself under the form of a living concrete monad.
It will be seen, however, when it comes to a "showing up" of what might be called the "trump cards" of axiomatic mystery, that the complex vision has in reality fewer of these ultimate irrational "data" than has the philosophy of the élan vital.
Space itself, whether we regard it as objective or subjective, is certainly not an irrational axiom but an entirely rational and indeed an entirely inevitable assumption. And what the complex vision reveals is that the trinity of "mysterious somethings" with which we are compelled to start our enquiry, namely the "something" which is the substratum of the soul, the "something" which is the "medium" binding all souls together, and the "something" which is the "objective mystery" out of which all souls create their universe, is, in fact, a genuine trinity in the pure theological sense; in other words is a real "three-in-one." And it is a "three-in-one" not only because it is unthinkable that three "incomprehensible substances" should exist in touch with one another without being in organic relation, but also because all three of them are dominated, in so far as we can say anything about them at all, by the same universal space.
It is true that the unappropriated mass of "objective mystery" upon which no shadow of the creative energy of any soul has yet been thrown must be considered as utterly "formless and void" and thus in a sense beyond space and time, yet since immediately we try to imagine or visualize this mystery, as well as just logically "consider" it, we are compelled to extend over it our conception of time and space, it is in a practical sense, although not in a logical sense, under the real dominion of these.
When therefore the philosophy of the complex vision places its trump-cards of axiomatic mystery over against the similar cards of the philosophy of the "élan vital" it will be found that in actual number Bergson has one more "card" than we have. For Bergson has not only his "pure spirit" and his "intuitively-felt time," but has also—for he cannot really escape from that by just asserting that his "spirit" produces it—the opposing obstinate principle of "matter" or "solid bodies" or "mechanical brains" upon which his pure spirit has to work.
It is indeed out of its difficulties with "matter," that is to say with bodies and brains, that Bergson's "spirit" is forced to forego its natural element of "intuitive duration" and project itself into the rigid rationalistic conceptualism of ordinary science and metaphysic.
The point of our argument in this place is that since the whole purpose of philosophy is articulation or clarification and since in this process of clarification the fewer "axiomatic incomprehensibles" we start with the better; it is decidedly to the advantage of any philosophy that it should require at the start nothing more than the mystery of the individual soul confronting the mystery of the world around it. And it is to the disadvantage of Bergson's philosophy that it should require at the start, in addition to "pure spirit" with its assumption of memory and will, and "pure matter" with its assumption of ordinary space and ordinary time, a still further axiomatic trump-card, in the theory of intuitive "durational" time, in which the real process of the life-flow transcends all reason and logic.
Putting aside however the cosmological aspect of our controversy with the "radical empirical" school of thought, we still have left unconsidered our most serious divergence from their position. This consists in the fact that both Bergson and James have entirely omitted from their original instrument of research that inalienable aspect of the human soul which we call the aesthetic sense.
With only a few exceptions—notably that of Spinoza—all the great European philosophers from Plato to Nietzsche have begun their philosophizing from a starting-point which implied, as an essential part of their "organum" of enquiry, the possession by the human soul of some sort of aesthetic vision.