The concept of causality as natural necessity, as distinguished from the concept of causality as freedom, concerns only the existence of things insofar as it is determinable in time and hence as appearances, as opposed to their causality as things in themselves. Now, if one takes the determinations of the existence of things in time for determinations of things-in-themselves (which is the most usual way of representing them), then the necessity in the causal relation can in no way be united with freedom; instead they are opposed to each other as contradictory. For, from the first it follows that every event, and consequently every action that takes place at a point of time, is necessary under the condition of what was in the preceding time. Now, since time past is no longer within my control, every action that I perform must be necessary by determining grounds that are not within my control, that is, I am never free at the point of time in which I act.
Indeed, even if I assume that my whole existence is independent from any alien cause (such as God), so that the determining grounds ot my causality and even of my whole existence are not outside me, this would not in the least transform that natural necessity into freedom. For, at every point of time I still stand under the necessity of being determined to action by that which is not within my control, and the series of events infinite a parte priori which I can only continue in accordance with a predetermined order would never begin of itself: it would be a continuous natural chain, and therefore my causality would never be freedom.
If, then, one wants to attribute freedom to a being whose existence is determined in time, one cannot, so far at least, except this being from the law of natural necessity as to all events in its existence and consequently as to its actions as well; for, that would be tantamount to handing it over to blind chance. But since this law unavoidably concerns all causality of things so far as their existence in time is determinable, if this were the way in which one had to represent also the existence of these things-in-themselves then freedom would have to be rejected as a null and impossible concept.
Consequently, if one still wants to save it, no other path remains than to ascribe the existence of a thing so far as it is determinable in time, and so too its causality in accordance with the law of natural necessity, only to appearance, and to ascribe freedom to the same being as a thing-in-itself. This is certainly unavoidable if one wants to maintain both these mutually repellent concepts together; but in application, when one wants to explain them as united in one and the same action, and so to explain this union itself, great difficulties come forward, which seem to make such a unification unfeasible.
If I say of a human being who commits a theft that this deed is, in accordance with the natural law of causality, a necessary result of determining grounds in preceding time, then it was impossible that it could have been left undone; how, then, can appraisal in accordance with the moral law make any change in it and suppose that it could have been omitted because the law says that it ought to have been omitted? That is, how can that man be called quite free at the same point of time and in regard to the same action in which and in regard to which he is nevertheless subject to an unavoidable natural necessity?
It is a wretched subterfuge to seek to evade this by saying that the kind of determining grounds of his causality in accordance with natural law agrees with a comparative concept of freedom, according to which that is sometimes called a free effect, the determining natural ground of which lies within the acting being, e.g., that which a projectile accomplishes when it is in free motion, in which case one uses the word “freedom” because while it is in flight it is not impelled from without; or as we also call the motion of a clock a free motion because it moves the hands itself, which therefore do not need to be pushed externally; in the same way the actions of the human being, although they are necessary by their determining grounds which preceded them in time, are yet called free because the actions are caused from within, by representations produced by our own powers, whereby desires are evoked on occasion of circumstances and hence actions are produced at our own discretion.
Some still let themselves be put off by this subterfuge and so think they have solved, with a little quibbling about words, that difficult problem on the solution of which millennia have worked in vain and which can therefore hardly be found so completely on the surface, That is to say, in the question about that freedom which must be put at the basis of all moral laws and the imputation appropriate to them, it does not matter whether the causality determined in accordance with a natural law is necessary through determining grounds lying within the subject or outside him, or in the first case whether these determining grounds are instinctive or thought by reason, if, as is admitted by these men themselves, these determining representations have the ground of their existence in time and indeed in the antecedent state; and this in turn in a preceding state, and so forth.
These determinations may be internal and they may have psychological instead of mechanical causality, that is, produce actions by means of representations and not by bodily movements; [still] they are always determinining grounds of the causality of a being insofar as its existence is determinable in time and therefore under the necessitating conditions of past time, which are thus, when the subject is to act, no longer within his control and which may therefore bring with them psychological freedom (if one wants to use this term for a merely internal chain of representations in the soul) but nevertheless natural necessity; and they therefore leave no transcendental freedom, which must be thought as independence from everything empirical and so from nature generally, whether it is regarded as an object of inner sense in time only or also of outer sense in both space and time; without this freedom (in the latter and proper sense), which alone is practical a priori, no moral law is possible and no imputation in accordance with it.
Just for this reason, all necessity of events in time in accordance with the natural law of causality can be called the mechanism of nature, although it is not meant in this that the things which are subject to it must be really material machines. Here one looks only to the necessity of the connection of events in a time series as it develops in accordance with natural law, whether the subject in which this development takes place is called automaton materiale, when the machinery is driven by matter, or with Leibniz spirituale, when it is driven by representations; and if the freedom of our will were none other than the latter (say, psychological and comparative but not also transcendental, i.e., absolute), then it would at bottom be nothing better than the freedom of a turnspit, which, when once it is wound up, also accomplishes its movements of itself.
Now, in order, in the case at hand, to remove the apparent contradiction between the mechanism of nature and freedom in one and the same action, one must recall what was said in the Critique of Pure Reason or follows from it: that the natural necessity which cannot coexist with the freedom of the subject attaches merely to the determinations of a thing which stands under conditions of time and so only to the determinations of the acting subject as appearance, and that, accordingly, the determining grounds of every action of the subject so far lie in what belongs to past time and is no longer within his control (in which must be counted his past deeds and the character as a phenomenon thereby determinable for him in his own eyes).
But the very same subject, being on the other side conscious of himself as a thing-in-itself, also views his existence insofar as it does not stand under conditions of time and himself as determinable only through laws that he gives himself by reason; and in this existence of his nothing is, for him, antecedent to the determination of his will, but every action — and in general every determination of his existence changing conformably with inner sense, even the whole sequence of his existence as a sensible being — is to be regarded in the consciousness of his intelligible existence as nothing but the consequence and never as the determining ground of his causality as a noumenon.
So considered, a rational being can now rightly say of every unlawful action he performed that he could have omitted it even though as appearance it is sufficiently determined in the past and, so far, is inevitably necessary; for this action, with all the past which determines it, belongs to a single phenomenon of his character, which he gives to himself and in accordance with which he imputes to himself, as a cause independent of all sensibility, the causality of those appearances.
The judicial sentences of that wonderful capacity in us which we call conscience are in perfect agreement with this. A human being may use what art he will to paint some unlawful conduct he remembers as an unintentional fault — as a mere oversight which one can never avoid altogether, and so as something in which he was carried away by the stream of natural necessity — and to declare himself innocent of it. He nevertheless finds that the advocate who speaks in his favor can by no means reduce to silence the prosecutor within him, if only he is aware that at the time he did this wrong he was in his senses, that is, had the use of his freedom; and while he explains his misconduct by certain bad habits, which by gradual neglect of attention he has allowed to grow in him to such a degree that he can regard his misconduct as their natural consequence, yet this cannot protect him from the reproach and censure he casts upon himself.
This is also the ground of repentance for a deed long past at every recollection of it, a painful feeling aroused by the moral disposition, which is empty in a practical way to the extent that it cannot serve to undo what has been done and would even be absurd. (Priestley, a genuine fatalist proceeding consistently, declares it absurd; and for this candor he deserves more applause than those who, while maintaining the mechanism of the will in deeds but its freedom in words, yet want it to be thought that they include it in their syncretistic system, though without making the possibility of such imputation comprehensible.) But repentance, as pain, is still quite legitimate because reason, when it is a question of the law of our intelligible existence (the moral law), recognizes no distinction of time and asks only whether the event belongs to me as a deed and, if it does, then always connects the same feeling with it morally, whether it was done just now or long ago. For, the sensible ljfe has, with respect to the intelligible consciousness of its existence (consciousness of freedom), the absolute unity of a phenomenon, which, so far as it contains merely appearances of the disposition that the moral law is concerned with (appearances of the character), must be appraised not in accordance with the natural necessity that belongs to it as appearance but in accordance with the absolute spontaneity of freedom.
One can therefore grant that if it were possible for us to have such deep insight into a human being’s cast of mind, as shown by inner as well as outer actions, that we would know every incentive to action, even the smallest, as well as all the external occasions affecting them, we could calculate a human being’s conduct for the future with as much certainty as a lunar or solar eclipse and could nevertheless maintain that the human being’s conduct is free. If, that is to say, we were capable of another view, namely an intellectual intuition of the same subject (which is certainly not given to us and in place of which we have only the rational concept), then we would become aware that this whole chain of appearances, with respect to all that the moral law is concerned with, depends upon the spontaneity of the subject as a thing-in-itself, for the determination of which no physical explanation can be given.
In default of this intuition, the moral law assures us of this difference between the relation of our actions as appearances to the sensible being of our subject and relation by which this sensible being is itself referred to the intelligible substratum in us. From this perspective, which is natural to our reason though inexplicable, appraisals can be justified which, though made in all conscientiousness, yet seem at first glance quite contrary to all equity. There are cases in which human beings, even with the same education that was profitable to others, yet show from childhood such early wickedness and progress in it so continuously into their adulthood that they are taken to be born villains and quite incapable of improvement as far as their cast of mind is concerned; and nevertheless they are so judged for what they do or leave undone that they are censured as guilty of their crimes; indeed, they themselves (the children) find these censures as well founded as if, despite the hopeless natural constitution of minds ascribed to the, they remained as accountable as any other human being.
This could not happen if we did not suppose that whatever arises from one’s choice (as every action intentionally performed undoubtedly does) has as its basis a free causality which from early youth expresses its character in its appearances (actions); these actions, on account of the uniformity of conduct, make knowable a natural connection that does not, however, make the vicious constitution of the will necessary but is instead the consequence of the evil and unchangeable principles freely adopted, which make it only more culpable and deserving of punishment.