The whole cycle of the philosophy of mind exhausts itself in the study of the four fundamental forms of human activity, the concepts of which we have seen slowly developing through the mazes of Croce's early speculations: the æsthetic, the logic, the economic and the ethic; of the distinction and the unity of æsthetic and logic in the theoretical activity, or knowledge, and of economic and ethic in the practical activity, or action; and finally of the relations between the theoretical and the practical, or knowledge and action. This may be said to be the positive aspect of Croce's philosophy: the negative aspect consists in the criticism and exclusion of any other form of activity from the system of the human spirit, and of that which is not the spirit, or nature, from the system of reality.
To the four forms or grades of spiritual activity, correspond four philosophical sciences: Æsthetics, Logic, Economics, and Ethics. Each of them can be said to be the organum of the particular form of activity which it studies; the affirmation of that sphere of consciousness which is proper to it, and of its relations to the other forms. Each of them is therefore related to the others in the same way as the various forms of activity are related to each other. They might be defined as the projection on the plane of logic of the whole system of human activity, that is, of the whole of reality. They derive their intrinsic validity from this perfect coincidence of their several objects with the only conceivable aspects of reality.
We shall in this and in the following chapters attempt to fill in with the strictly necessary detail this very ample frame. But we can already point to the idealistic character of such a philosophy resulting from its method, which is that of the testimony of consciousness, as opposed to the naturalistic or psychologic method of indirect observation; from its object, which is the human spirit or mind in the fulness of its determinations; and from the exclusion of any aspect of reality which is not immanent in consciousness, that is, both of the naturally and the supernaturally transcendent. As against another kind of idealism, of which the typical example is Platonic transcendentalism, Croce's idealism is realistic and immanentistic: the task of the philosophy of mind is to discover the immanent logic of reality. But against current realism, which considers mind as the mere spectator and observer of external or natural reality, it asserts the identity of reality and consciousness, which is the basic position of all idealism.
There are two forms of knowledge: intuitive (or æsthetic) and conceptual (or logical). Intuition is the knowledge of the individual or particular; the concept is the knowledge of the universal. This distinction, as we have already seen, corresponds roughly to the old classical distinction of mythos and logos, to Vico's definitions of poetry and metaphysics, and to the new meaning given by Baumgarten to the old antithesis of aisthēta and noēta. Let us quote Vico again: "Men first feel without perceiving, then they perceive and are perturbed and moved; finally they reflect with pure mind." Here we have three successive grades, of which the first is mere sensation, the lower limit of mental activity; the second is intuition; the third, concept. For Vico, the second grade is identical with Poetry, and the science of this form of knowledge, which we call Æsthetics, he called Poetic Logic, the science of poetry as "the first operation of the human mind." Vico's discovery consists in this definition of Poetry (and Art), not as a casual, capricious, lateral form of spiritual activity, but as the first and necessary grade of knowledge, as an essential function of the mind. But Vico's thought was clothed in what we might well call a mythological form: the various grades of spiritual activity were presented by him as successive stages or epochs in the history of mankind; and the inter-relation of the various grades, as the actual law of the development of human society. Croce unravelled Vico's philosophy, or ideal history, history of the mind, from Vico's concrete, sociological history, and the result was this new Æsthetics which is at the same time a science of the first grade of knowledge, and of art and language.
Of the reality of intuitive, as distinct from reflected knowledge, we have constant evidence in our immediate experience. If I examine my own consciousness, at any particular moment, I find it crowded with things I know, as, now, this room in which I am writing, the piano that is open before me, the flowers in a little basket, blue fragments of sky and green branches washed by the recent rain swaying in the clear sunlight, the shrill voice of a child from the road, the light steps of a girl moving about the house. I am not conscious of all these intuitions at once: I write, and I distinctly know this white paper only, and the black signs I am tracing, the pen guided by my hand, and the edges of a few books on my table: all the rest has faded away into a blurred, fused intuition, the intuition of an atmosphere, composed of mere shreds and shadows of the colours and sounds of which I was so distinctly conscious but one minute ago. But now I put down my pen again, and I look at the piano; and I let my mind wander away, from what I see to what I remember or imagine: the fair-headed figure playing this morning Franck's Prelude, Choral and Fugue, the rapid and sure movements of the fingers on the white and black keys, a vague image of the solemn and passionate music, memories of distant days, a sudden rush of obscure fantasies, evoked by the actual playing, and still lingering in the recesses of my mind, returning now with a fragment of a melody, with a succession of triumphant chords. And again, I look beyond the window, and the little square of green and blue expands itself into the vast valley beyond, screened from my view by these few trees clustering around the house, and yet mysteriously present to my inner eye: I see a little company of riders cantering along a shaded lane, coming out in an open meadow surrounded by low, thick-wooded hills; the sun sets in a pale purple sky, and I hear the tramping of the slow, heavy hoofs, as the horses find their way back through the woods, through a darkness much more opaque and solid than that of the remote twilight, still visible above the highest branches, animated by the first faint glittering of a star. And the woods are full of a myriad small breathing and stirring noises, of the sense of the deep surging inhuman life of trees and shrubs, of the penetrating scent of the rich damp earth, of decaying wood, of fallen leaves.
And now, I suddenly shut myself out of this world of perceptions and imaginations, or rather I keep them all before me, but not because of the immediate, individual interest I have in each of them. I try to extract the common, the universal element of which I suspect the existence not beyond but within them. I renounce all particular intuitions for the concept of intuition. I am no longer an image-making mind, no longer engaged in this elementary or "first" operation of the human mind, but I have passed on to a different, and manifestly a "secondary" plane of mental activity, since it would be impossible for me to root my thinking anywhere but on the soil of my intuitions.
What, then, is intuition? Clearly it is not the mere sensation, the formless matter which the mind cannot grasp in itself, as mere matter, but possesses only by imposing its form on it. Without matter no human knowledge or activity is possible, but matter is, within ourselves, the animal element, that which is brutal and impulsive, not the spiritual domain, which is humanity. Matter conquered by form gives place to the concrete form. Matter, or content, is what differentiates one intuition from another; the form is constant, and the form is the spiritual activity. In this way we set the lower limit of intuitive knowledge, and we recognize its characters of awareness and activity: an intuition is not that which presents itself to me, but that which I make my own, by giving form to it. It may be an actual perception, but the distinction between that which is real and that which is imaginary is not an intuitive, but a logical or intellectual one; the knowledge of things which I do not perceive, but only remember, or even only create with my imagination belongs to the same class, partakes of the same formal character. Space and time, which have more than once been considered as intuitions, are in reality categories of an intellectual order: they may be found in intuitions, as other intellectual elements are found, but as ingredients and not as necessary elements, materialiter and not formaliter. In relation to the usual psychological concepts of association and representation, it can be said that an intuition is an association, when by that word we mean an active mental synthesis, and not a mechanical juxtaposition of abstract sensations; and that it is a representation, not as a complex sensation, but as a spiritual elaboration of the sensation.
The upper limit of intuitive knowledge is given by reflected, or intellectual, or logical knowledge, or whatever we may call that which is no longer knowledge of the individual, of things, but of the universal, of relations among things, of concepts. Intuitive knowledge is independent of intellectual knowledge, as it is possible to form intuitions without forming concepts; in the examples which I have given in the preceding paragraph, practically all the intuitions are pure intuitions, in the sense that they do not contain any logical ingredients. But even when such are found, they appear as mere intuitions, and not as concepts: as, for instance, Hamlet's philosophy, which I do not read as a help towards the understanding of metaphysical problems, but as a characterization of an imaginery individual. On the other hand, logical knowledge is founded on intuitions, presupposes the world of intuitions as its matter or content. The relation between æsthetic and logical knowledge is one of grade or development: the former stands by itself, rests directly on that which is not yet spirit or form, is the first grade of spiritual or human activity; the latter gives a further spiritual elaboration to the intuitive material. This relationship, to which we shall return later, is the typical process of Croce's own logic, the logic of spiritual or mental grades, which he substitutes throughout his system for the naturalistic or transcendental logic of his early masters.