The limits of science and Kantian scepticism.
But a limitation of value due also to Kant, accompanies this theoretic reinforcement of exact science. That science is necessary, because produced by the categories; but the categories cannot develop their activity except upon the data of experience; so that exact science is limited to experience, and whenever it makes the attempt to surpass it, it becomes involved in antinomies and paralogisms and gesticulates in the void. Science moves among phenomena and can never penetrate beyond them and attain to the "Thing in itself."
The limits cf science and Jacobi.
It would seem from this that Kant was bound to end in a renovated nominalism and mysticism, and indeed such is partly the case. Contemporaneously with him, Jacobi also observed the limit in which is enclosed the mechanical and determinist science of nature (the highest philosophic expression of which was then found in the Ethic of Spinoza), since it works with the principle of causation and is impotent, unless it wishes to commit suicide, to leave the finite which it describes in a causal series, and Jacobi concluded in favour of mysticism and of feeling, the organ of the Knowledge of God. Kant, like Jacobi, in his turn has recourse to the non-theoretic form of the spirit, to the practical reason and its postulates, to provide that certitude of God, of immortality, and of human freedom, which is not evident to the theoretic reason. But in Kant there are other positive elements which are not in Jacobi, and these elements, although not sufficiently elaborated by him and not harmonized with one another, confer upon his philosophy the value of a new Logic, more or less sketched. For he recognizes not only a theoretic but also a practical reason, which cannot be called simply practical, if it in any way produce (although only under the title of postulates), knowledge (and knowledge of supreme importance). He recognises also an æsthetic judgment, which, although developed without concepts, does not belong to the sphere of practical interests; and a teleological judgment, which is regulative and not constitutive, but not on this account arbitrary or without meaning. Finally, the very contradictions, in which the intellect becomes involved, when it wishes to apply the categories beyond experience, could not reasonably be considered by him to be mere errors, because they constitute serious problems, if the intellect becomes involved in them, not capriciously, but of necessity. All this presages the coming of a new Logic, which shall set in their places these scattered elements of truth and solve the contradictions.
The a priori synthesis.
But the Kantian philosophy also contains, in addition to these elements and these stimulations, the concept of the new Logic in the a priori synthesis. This synthesis is the unity of the necessary and the contingent, of concept and intuition, of thought and representation, and consequently is the pure concept, the concrete universal.
The intimate contradiction of Kant. Romantic principle and classical execution.
Kant was not aware of this; and instead of developing with a mind free from prejudice the thought of his genius, he also allowed himself to be vanquished by the abstractionism of his time and out of the logical and philosophical a priori synthesis he made the more or less arbitrary a priori synthesis of the sciences. In this way, the apriority of the intuition led him, not to art, but to mathematics (transcendental Æsthetic)[14] the apriority of the intellect led him, not to Philosophy, but to Physics (abstract intellect): hence the impotence which afflicted that synthesis, when confronted with philosophic problems. When he discovered the a priori synthesis, Kant had laid his hand upon a profoundly romantic concept; but his treatment of it became afterwards classicist and intellectualist. The synthesis is the palpitating reality which makes itself and knows itself in the making: the Kantian philosophy makes it rigid again in the concepts of the sciences; and it is a philosophy in which the sense of life, of imagination, of individuality, of history, is almost as completely absent as in the great systems of the Cartesian period. Whoever is not aware of this intimate drama and fails to understand this contradiction; whoever, when confronted with the work of Kant, is not seized with the need, either of going forward or of going backward, has not reached the heart of that soul, the centre of that mind. The old philosophers who condemned Kant as sceptical and as a corrupter of philosophy, and who confined themselves strictly to Wolfianism and to scholasticism, and the new who greeted him as a precursor and made of him a stepping-stone on which to mount higher,—these alone came truly into contact with Kant's philosophy. For in his case there are but two alternatives: abhorrence or attraction, loathing or love. In the midst of a battle one must flee or fight: to sit still and take one's ease is the attitude of the unconscious and the mad. Certainly it is better to fight than to flee, but it is better to flee than to sit inactive. He who flees, saves at least his own skin, or, to abandon metaphor, saves the old philosophy, which is still something; but the inactive man loses both life and glory, the old philosophy and the new.
Advance upon Kant: Fichte, Schelling, Hegel.
The new philosophy was that of the three great post-Kantians, Fichte, Schelling and Hegel. With Fichte, all trace of the thing in itself has disappeared and the dominating concept is that of the Ego, that is, of the Spirit, which creates the world by means of the transcendental imagination and recreates it in thought. In Schelling is found the concept of the Absolute, the unity of subject and object, which has, as its instrument, intellectual intuition. In Hegel, there is this same concept, but it has itself as instrument, that is to say, it is truly logical. All three are Kantians, but all three (and especially the last two) are not simply Kantian. They employed elements which Kant ignored or employed timidly, and in particular the mystical tradition and the new tendencies of æsthetic and historical thought. Thus they pass beyond the abstractionism and intellectualism of the Kantian period, and inaugurate the nineteenth century. They are connected ideally with Vico (Hamann was the little German Vico), and they enrich him with the thoughts of Kant.