I have to remark, in the first place, that at present I treat of the conception of ******* in the practical sense only, and set aside the corresponding transcendental conception, which cannot be employed as a ground of explanation in the phenomenal world, but is itself a problem for pure reason.A will is purely animal (arbitrium brutum) when it is determined by sensuous impulses or instincts only, that is, when it is determined in a pathological manner.A will, which can be determined independently of sensuous impulses, consequently by motives presented by reason alone, is called a free will (arbitrium liberum); and everything which is connected with this free will, either as principle or consequence, is termed practical.The existence of practical ******* can be proved from experience alone.For the human will is not determined by that alone which immediately affects the senses; on the contrary, we have the power, by calling up the notion of what is useful or hurtful in a more distant relation, of overcoming the immediate impressions on our sensuous faculty of desire.But these considerations of what is desirable in relation to our whole state, that is, is in the end good and useful, are based entirely upon reason.This faculty, accordingly, enounces laws, which are imperative or objective laws of ******* and which tell us what ought to take place, thus distinguishing themselves from the laws of nature, which relate to that which does take place.The laws of ******* or of free will are hence termed practical laws.
Whether reason is not itself, in the actual delivery of these laws, determined in its turn by other influences, and whether the action which, in relation to sensuous impulses, we call free, may not, in relation to higher and more remote operative causes, really form a part of nature- these are questions which do not here concern us.
They are purely speculative questions; and all we have to do, in the practical sphere, is to inquire into the rule of conduct which reason has to present.Experience demonstrates to us the existence of practical ******* as one of the causes which exist in nature, that is, it shows the causal power of reason in the determination of the will.The idea of transcendental *******, on the contrary, requires that reason- in relation to its causal power of commencing a series of phenomena- should be independent of all sensuous determining causes; and thus it seems to be in opposition to the law of nature and to all possible experience.It therefore remains a problem for the human mind.But this problem does not concern reason in its practical use; and we have, therefore, in a canon of pure reason, to do with only two questions, which relate to the practical interest of pure reason: Is there a God? and, Is there a future life? The question of transcendental ******* is purely speculative, and we may therefore set it entirely aside when we come to treat of practical reason.Besides, we have already discussed this subject in the antinomy of pure reason.
SECTION II.Of the Ideal of the Summum Bonum as a Determining Ground of the Ultimate End of Pure Reason.
Reason conducted us, in its speculative use, through the field of experience and, as it can never find complete satisfaction in that sphere, from thence to speculative ideas- which, however, in the end brought us back again to experience, and thus fulfilled the purpose of reason, in a manner which, though useful, was not at all in accordance with our expectations.It now remains for us to consider whether pure reason can be employed in a practical sphere, and whether it will here conduct us to those ideas which attain the highest ends of pure reason, as we have just stated them.We shall thus ascertain whether, from the point of view of its practical interest, reason may not be able to supply us with that which, on the speculative side, it wholly denies us.
The whole interest of reason, speculative as well as practical, is centred in the three following questions:
1.WHAT CAN I KNOW?
2.WHAT OUGHT I TO DO?
3.WHAT MAY I HOPE?
The first question is purely speculative.We have, as I flatter myself, exhausted all the replies of which it is susceptible, and have at last found the reply with which reason must content itself, and with which it ought to be content, so long as it pays no regard to the practical.But from the two great ends to the attainment of which all these efforts of pure reason were in fact directed, we remain just as far removed as if we had consulted our ease and declined the task at the outset.So far, then, as knowledge is concerned, thus much, at least, is established, that, in regard to those two problems, it lies beyond our reach.
The second question is purely practical.As such it may indeed fall within the province of pure reason, but still it is not transcendental, but moral, and consequently cannot in itself form the subject of our criticism.
The third question: If I act as I ought to do, what may I then hope?- is at once practical and theoretical.The practical forms a clue to the answer of the theoretical, and- in its highest form-speculative question.For all hoping has happiness for its object and stands in precisely the same relation to the practical and the law of morality as knowing to the theoretical cognition of things and the law of nature.The former arrives finally at the conclusion that something is (which determines the ultimate end), because something ought to take place; the latter, that something is (which operates as the highest cause), because something does take place.