Kant’s argument is as follows. The antinomies rest upon the principle that if the conditioned be given, the entire series of all its conditions is likewise given. If the objects of the senses were independently real, there would be no escape from this assumption, and the dialectical conflict would consequently be irresolvable. Transcendental idealism, as above stated, reveals a way out of the dilemma. As appearances are merely representations, their antecedent conditions do not exist as appearances, save in the degree in which they are mentally constructed. Though the appearances are given, their empirical conditions are not thereby given. The most that we can say is that a regress to the conditions, i.e. a continued empirical synthesis in that direction, is commanded or required. The cosmological argument can thus be shown to be logically invalid. The syllogism, which it involves, is as follows:
If the conditioned be given, the entire series of all its conditions is likewise given.
The objects of the senses are given.
Therefore the entire series of all their conditions is likewise given.
In the major premiss the concept of the conditioned is employed transcendently (Kant says transcendentally), in the minor empirically. But though the inference thus commits the logical fallacy of sophisma figurae dictionis, the ground of its occurrence, and the reason why it is not at once detected, lie in a natural and inevitable illusion which leads us to accept the sensible world in space as being independently real. Only through Critical investigation can the deceptive power of this illusion be overcome. Owing to its influence, the above fallacy has been committed by dogmatists and empiricists alike. It can be shown that in refuting each other
... “they are really quarrelling about nothing, and that a certain transcendental illusion has caused them to see a reality where none is to be found.”[1556]
The existence of antinomy, Kant further argues, presupposes that theses and antitheses are contradictory opposites, i.e. that no third alternative is possible. When opposed assertions are not contradictories but contraries, the opposition, to use Kant’s terms, is not analytical but dialectical. Both may be false; for the one does not merely contradict the other, but makes, in addition, a further statement on its own account. Now examination of the illusion above described enables us to perceive that the opposites, in reference to which antinomy occurs, are of this dialectical character. Theses and antitheses are alike false. Since the world does not exist as a thing in itself, it exists neither as an infinite whole nor as a finite whole, but only in the degree in which it is constructed in an empirical regress. We must not apply “the Idea of absolute totality, which is valid only as a condition of things in themselves,”[1557] to appearances. (The words which I have italicised mark the emergence of Kant’s non-sceptical, non-empirical view of the nature and function of the Ideas of Reason.) Thus antinomy, rightly understood, does not favour scepticism, but only the “sceptical method,” and indeed yields an indirect proof of the correctness of Critical teaching. This proof may be presented in the form of a dilemma. If the world is a whole existing in itself, it is either finite or infinite. But the former alternative is refuted by the proofs given of the antitheses, and the latter alternative by the proofs of the theses. Therefore the world cannot be a whole existing in itself. From this it follows that appearances are nothing outside our representations; and that is what is asserted in the doctrine of transcendental idealism.
In A 499 = B 527 Kant uses ambiguous language,[1558] which can be interpreted as asserting that in the regress there can be no lack of given conditions. Such a statement would presuppose positive knowledge regarding the unknown transcendental object.[1559] The opposite, more correct, view is given in A 514-15 = B 542-3 and A 517 ff. = B 545 ff., though in the latter passage with a reversion to the above position.[1560]
The earlier manuscripts, which Kant has so far been employing, probably terminate either, as Adickes suggests,[1561] at the end of this section, or at the close of Section VIII., which is of doubtful date. Section IX. is certainly from a later period; it represents a more complex standpoint, in which Reason is no longer viewed as possessing a merely empirical function, and in which consequently the theses and antitheses are no longer indiscriminately denounced as being alike false. Under the influence of his later, more Idealistic preoccupations, Kant so far modifies the above solution as to assert that in the ease of the last two antinomies both theses and antitheses are true, when properly interpreted.
SECTION VIII
THE REGULATIVE PRINCIPLE OF PURE REASON IN REGARD TO THE COSMOLOGICAL IDEAS[1562]