If there is a point on which philosophers, in spite of themselves, have finally succeeded in agreeing, it is without doubt the distinction between intelligence and necessity, the subject of thought and its object, the me and the not-me; in ordinary terms, spirit and matter. I know well that all these terms express nothing that is real and true; that each of them designates only a section of the absolute, which alone is true and real; and that, taken separately, they involve, all alike, a contradiction. But it is no less certain also that the absolute is completely inaccessible to us; that we know it only by its opposite extremes, which alone fall within the limits of our experience; and that, if unity only can win our faith, duality is the first condition of science. Thus, who thinks, and what is thought? What is a soul? what is a body? I defy any one to escape this dualism. It is with essences as with ideas: the former are seen separated in Nature, as the latter in the understanding; and just as the ideas of God and immortality, in spite of their identity, are posited successively and contradictorily in philosophy, so, in spite of their fusion in the absolute, the me and the not-me posit themselves separately and contradictorily in Nature, and we have beings who think, at the same time with others which do not think. Now, whoever has taken pains to reflect knows today that such a distinction, wholly realized though it be, is the most unintelligible, most contradictory, most absurd thing which reason can possibly meet. Being is no more conceivable without the properties of spirit than without the properties of matter: so that if you deny spirit, because, included in none of the categories of time, space, motion, solidity, etc., it seems deprived of all the attributes which constitute reality, I in my turn will deny matter, which, presenting nothing appreciable but its inertia, nothing intelligible but its forms, manifests itself nowhere as cause (voluntary and free), and disappears from view entirely as substance; and we arrive at pure idealism, that is, nihility. But nihility is inconsistent with the existence of living, reasoning--I know not what to call them--uniting in themselves, in a state of commenced synthesis or imminent dissolution, all the antagonistic attributes of being. We are compelled, then, to end in a dualism whose terms we know perfectly well to be false, but which, being for us the condition of the truth, forces itself irresistibly upon us; we are compelled, in short, to commence, like Descartes and the human race, with the me; that is, with spirit.