These inconsistencies and errors which we have briefly reviewed are due partly to Vico's insufficient power of distinguishing and elaborating, partly—and this is the greater part—to that fundamental fault which we have already seen to exist in the structure of the New Science. In this case the fault is, more precisely, Vico's confusion between the philosophical concept of the poetic form of the mind, and the empirical concept of the barbaric form of civilisation. "This earliest age of the world," as he himself says, "can be truly said to have concerned itself exclusively with the primary activity of the mind." But the earliest age of the world, composed as it was of men of flesh and blood, not of philosophical categories, cannot have been concerned with one solitary activity of the mind. This single activity may have preponderated, as we generally say: the very word reveals the quantitative and approximative nature of the conception: but all the others must have been at work simultaneously, imagination and intellect, perception and abstraction, will and morality, song and arithmetic. Vico could not shut his eyes to this obvious fact, and introduced into this phase of civilisation not only the poet, but also the theologian, the physicist, the astronomer, the pater-familias, the warrior, the politician, and the lawgiver; but he tried to regard the activities of all these as "poetical" in character, as he called it, by a metaphor drawn from the alleged preponderance of the imaginative form of the mind; and the whole system he called "poetic wisdom." The metaphorical nature of the terminology is suggested, in fact leaps to the eye, in certain characteristic passages, as where the "arts," that is, the mechanical crafts which produce objects of practical utility, are called "poetry with a certain kind of reality," and where ancient Roman law, because of the abundance of formulae and ceremonies with which it was adorned, is said to be a "serious dramatic poem." But the metaphors are dangerous, since, as in the case of the New Science, they light upon a soil favourable to their growth into concepts: and in point of fact the historical phase of barbarism, metaphorically expressed as poetic wisdom, soon turned in Vico's mind into the ideal phase of poetry, and transferred all its own attributes to this ideal phase. The former included theologians, and accordingly Vico regarded poetry as theology, but an imaginative theology: teachers, and poetry became a teacher, but of the common people: natural scientists, and it became science, but the science of an imaginary world. And since these barbarians, uncultivated as they were and confined to the world of images, could not think in concepts, the imaginations of poetry, individualised and particular, and its judgments, always expressed in material form, were falsely interpreted as "imaginative universals," supposed to be something intermediate between the individualising intuition and the universalising concept. Poetry, which ought to represent sense and nothing else, came to represent a sense already intellectualised; and the saying that nothing is found in the intellect that has not already been in the sense, acquired the meaning, that the intellect is nothing but the sense clarified, and the sense nothing but the intellect confused. Thus there was no further need for the added caution "except the intellect itself" (nisi intellectus ipse). Conversely, barbaric civilisation became a kind of mythological or allegorical representation of the ideal phase of poetry, and primitive tribes were transformed into crowds of "sublime poets" just as, in the ontogenesis corresponding to this philogenesis, children had been made into poets. The concept of the "imaginative universal" unites in itself the double contradiction of the doctrine; since to the imaginative element must be joined, in this mental construction, the element of universality which taken by itself would be a true and proper universal, rational and not imaginative. Hence arises a petitio principii by which the origin of the rational universal, the point requiring explanation, is already presupposed. On the other hand, if the imaginative universal is interpreted as freed from the element of universality, that is, as a mere imagination, Vico's aesthetic doctrine would certainly become once more consistent: but his "poetic wisdom" or barbaric civilisation would be deprived of an indispensable portion of its organism in parting with every kind of concept: for concepts are, so to speak, the skeleton of the body.
To resolve the contradiction it was necessary to separate poetry from poetic wisdom: and we do find some signs of this separation in Vico. He sometimes admits, almost against his will, the lack of correspondence between the philosophical category and the type of society, and in dealing with the latter is compelled to fall back upon such phrases as "very nearly" and "more or less." He says, for instance, that primitive man consisted "exclusively of strong imagination, with no, or very little, reason": that he was "almost all body, with hardly any reflection": or again, after making a show of philosophical distinction between the three languages of gods, heroes and men, he goes on to observe that "the language of the gods was almost all dumb, and very little articulate; the language of heroes was composed of equal quantities of articulation and dumb-show; the language of men was almost all articulated, and very little in dumb-show." He admits again in a fine simile that poetic speech out-lived poetic wisdom and survived far into the historic and civilised period, "as great and rapid rivers run far out into the sea and keep their waters fresh as they bear them along with the force of their flow." Even in modern times we cannot afford entirely to neglect imaginative speech: "to describe the operations of the pure mind, we must avail ourselves of poetic language, of metaphors drawn from the senses." It appears that poetry does not end with barbarism, for poets arise even in civilised times: and if it is said that the poets of the earliest times were naturally imaginative, those of later days artificially so, that is, according to Vico, by deliberately forgetting the proper use of words, freeing themselves from philosophy, filling their minds with childish and vulgar prejudices and submitting to the bondage of conventions like the use of rhyme—all these restrictions, besides being easily refuted, are merely an unsuccessful attempt to diminish the weight of the fact above mentioned, namely that poetry belongs to all ages, not merely to that of barbarism: it is an ideal category, not a historic fact. But the restrictions prove, as also do the infrequency and the unemphatic nature of the passages quoted, that Vico was not in a position to effect the separation of poetry from poetic wisdom, hampered as he was by the hybrid character of the concept and of the actual method of the New Science.
If, on the other hand, the idea of poetry as pure imagination had not remained firmly at the foundation of Vico's thought, in spite of all the confusions and inconsistencies in which it became involved, and had not been at work underground, so to speak, in the New Science, it would have been difficult or perhaps impossible to understand the leading conception which dominates his philosophy of mind, closely connected as it is with that idea. This is the conception of the mind as a development, or, to use Vico's own words, a progress or unfolding (corso, spiegamento); a conception which improved upon, though it did not explicitly contradict, the ordinary view which was almost exclusively confined to the enumeration and classification of the mind's faculties. The doctrine of imaginative universals as spontaneous mental products, rudimentary universals but not without an element of truth in them, was at least an adequate weapon against the empirical theory which made civilisation the outcome of a highly developed and rational practical wisdom and the personal labour of God or of wise men who must have sprung from the earth or fallen from heaven in some unaccountable manner.
Vico clearly stated the dilemma between the two, and only two, possible explanations of the origin of society. Either it came from the reflection of wise men, or from a certain human feeling and instinct among brutish men. He accepted the latter solution, that of "brutes" which gradually became human: the theory, that is, of the evolution of thought from the imaginative to the rational universal, and the progress of social relations from force to equity. But was this an adequate foundation for "ideal history" or the philosophy of mind? In the philosophy of mind, it could be translated into a similar if not identical view—the doctrine which, owing to Cartesianism and a certain recrudescence of the Scholasticism of Duns Scotus, lasted down to Vico's own times and expressed the life of the mind by the successive stages of the concept, obscurity, confusion, clarity and distinctness. Leibniz, as is well known, made a special study of obscure and confused perceptions, the "petites perceptions." The doctrine was essentially intellectualistic, since the concepts, however confused or obscure, were never anything else than concepts: and hence it was unable to account either for poetry or even for mental development, the dialectic of which cannot be understood if it is regarded as consisting of merely quantitative differences. Such differences are in reality not differences at all, but identities and therefore the negation of change: and in fact the whole of this school of thought was anti-aesthetic and static, devoid both of a true theory of imagination and a true theory of development. Vico's thought, on the other hand, was averse to intellectualism and in sympathy with imagination: it was entirely dynamic and evolutionary. For Vico, mind is an eternal drama: and since drama demands antithesis, his philosophy of mind is rooted in antithesis, that is in the real distinction and opposition between imagination and thought, poetry and metaphysic, force and equity, passion and morality; although he seems sometimes, for the reasons given above, to mistake its nature; or rather, although he actually does sometimes confuse it with empirical inquiries and doctrines, and with the determinations of history.