My object in thus recalling Kant’s doctrine to your mind is not to express any opinion as to the accuracy of this particularly uncouth part of his philosophy, but only to illustrate the characteristic of human nature which we are considering, by an example so classical in its exaggeration. The sentiment of reality can indeed attach itself so strongly to our object of belief that our whole life is polarized through and through, so to speak, by its sense of the existence of the thing believed in, and yet that thing, for purpose of definite description, can hardly be said to be present to our mind at all. It is as if a bar of iron, without touch or sight, with no representative faculty whatever, might nevertheless be strongly endowed with an inner capacity for magnetic feeling; and as if, through the various arousals of its magnetism by magnets coming and going in its neighborhood, it might be consciously determined to different attitudes and tendencies. Such a bar of iron could never give you an outward description of the agencies that had the power of stirring it so strongly; yet of their presence, and of their significance for its life, it would be intensely aware through every fibre of its being.
It is not only the Ideas of pure Reason, as Kant styled them, that have this power of making us vitally feel presences that we are impotent articulately to describe. All sorts of higher abstractions bring with them the same kind of impalpable appeal. Remember those passages from Emerson which I read at my last lecture. The whole universe of concrete objects, as we know them, swims, not only for such a transcendentalist writer, but for all of us, in a wider and higher universe of abstract ideas, that lend it its significance. As time, space, and the ether soak through all things, so (we feel) do abstract and essential goodness, beauty, strength, significance, justice, soak through all things good, strong, significant, and just.
Such ideas, and others equally abstract, form the background for all our facts, the fountainhead of all the possibilities we conceive of. They give its “nature,” as we call it, to every special thing. Everything we know is