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or himself are not laws by which one is inevitably bound； because reason in practical matters has to do with the subject； namely； with the faculty of desire； the special character of which may occasion variety in the rule。 The practical rule is always a product of reason； because it prescribes action as a means to the effect。 But in the case of a being with whom reason does not of itself determine the will； this rule is an imperative； i。e。； a rule characterized by 〃shall；〃 which expresses the objective necessitation of the action and signifies that； if reason completely determined the will； the action would inevitably take place according to this rule。 Imperatives； therefore； are objectively valid； and are quite distinct from maxims； which are subjective principles。 The former either determine the conditions of the causality of the rational being as an efficient cause； i。e。； merely in reference to the effect and the means of attaining it； or they determine the will only； whether it is adequate to the effect or not。 The former would be hypothetical imperatives； and contain mere precepts of skill； the latter； on the contrary； would be categorical； and would alone be practical laws。 Thus maxims are principles； but not imperatives。 Imperatives themselves； however； when they are conditional （i。e。； do not determine the will simply as will； but only in respect to a desired effect； that is； when they are hypothetical imperatives）； are practical precepts but not laws。 Laws must be sufficient to determine the will as will； even before I ask whether I have power sufficient for a desired effect； or the means necessary to produce it； hence they are categorical： otherwise they are not laws at all； because the necessity is wanting； which； if it is to be practical； must be independent of conditions which are pathological and are therefore only contingently connected with the will。 Tell a man； for example； that he must be industrious and thrifty in youth； in order that he may not want in old age； this is a correct and important practical precept of the will。 But it is easy to see that in this case the will is directed to something else which it is presupposed that it desires； and as to this desire； we must leave it to the actor himself whether he looks forward to other resources than those of his own acquisition； or does not expect to be old； or thinks that in case of future necessity he will be able to make shift with little。 Reason； from which alone can spring a rule involving necessity； does； indeed； give necessity to this precept （else it would not be an imperative）； but this is a necessity dependent on subjective conditions； and cannot be supposed in the same degree in all subjects。 But that reason may give laws it is necessary that it should only need to presuppose itself； because rules are objectively and universally valid only when they hold without any contingent subjective conditions； which distinguish one rational being from another。 Now tell a man that he should never make a deceitful promise； this is a rule which only concerns his will； whether the purposes he may have can be attained thereby or not； it is the volition only which is to be determined a priori by that rule。 If now it is found that this rule is practically right； then it is a law； because it is a categorical imperative。 Thus； practical laws refer to the will only； without considering what is attained by its causality； and we may disregard this latter （as belonging to the world of sense） in order to have them quite pure。
II。 THEOREM I。
All practical principles which presuppose an object （matter） of the faculty of desire as the ground of determination of the will are empirical and can furnish no practical laws。 By the matter of the faculty of desire I mean an object the realization of which is desired。 Now； if the desire for this object precedes the practical rule and is the condition of our making it a principle； then I say （in the first place） this principle is in that case wholly empirical； for then what determines the choice is the idea of an object and that relation of this idea to the subject by which its faculty of desire is determined to its realization。 Such a relation to the subject is called the pleasure in the realization of an object。 This； then； must be presupposed as a condition of the possibility of determination of the will。 But it is impossible to know a priori of any idea of an object whether it will be connected with pleasure or pain； or be indifferent。 In such cases； therefore； the determining principle of the choice must be empirical and； therefore； also the practical material principle which presupposes it as a condition。 In the second place； since susceptibility to a pleasure or pain can be known only empirically and cannot hold in the same degree for all rational beings； a principle which is based on this subjective condition may serve indeed as a maxim for the subject which possesses this susceptibility； but not as a law even to him （because it is wanting in objective necessity； which must be recognized a priori）； it follows； therefore； that such a principle can never furnish a practical law。
III。 THEOREM II。
All material practical principles as such are of one and the same kind and come under the general principle of self…love or private happiness。 Pleasure arising from the idea of the idea of the existence of a thing； in so far as it is to determine the desire of this thing； is founded on the susceptibility of the subject； since it depends on the presence of an object； hence it belongs to sense （feeling）； and not to understanding； which expresses a relation of the idea to an object according to concepts； not to the subject according to feelings。 It is； then； practical only in so far as the faculty of desire is determined by the sensation of agreeableness which the subject expects from the actual existence of the object。 Now； a rational being's consciousness of the pleasantness of life uninterruptedly accompanying his whole existence is happiness； and the principle which makes this the supreme ground of determination of the will is the principle of self…love。 All material principles； then； which place the determining ground of the will in the pleasure or pain to be received from the existence of any object are all of the same kind； inasmuch as they all belong to the principle of self…love or private happiness。
COROLLARY。
All material practical rules place the determining principle of the will in the lower desires； and if there were no purely formal laws of the will adequate to determine it； then we could not admit any higher desire at all。
REMARK I。
It is surprising that men； otherwise acute； can think it possible to distinguish between higher and lower desires； according as the ideas which are connected with the feeling of pleasure have their origin in the senses or in the understanding； for when we inquire what are the determining grounds of desire； and place them in some expected pleasantness； it is of no consequence whence the idea of this pleasing object is derived； but only how much it pleases。 Whether an idea has its seat and source in the understanding or not； if it can only determine the choice by presupposing a feeling of pleasure in the subject； it follows that its capability of determining the choice depends altogether on the nature of the inner sense； namely； that this can be agreeably affected by it。 However dissimilar ideas of objects may be； though they be ideas of the understanding； or even of the reason in contrast to ideas of sense； yet the feeling of pleasure； by means of which they constitute the determining principle of the will （the expected satisfaction which impels the activity to the production of the object）； is of one and the same kind； not only inasmuch as it can only be known empirically； but also inasmuch as it affects one and the same vital force which manifests itself in the faculty of desire； and in this respect can only differ in degree from every other ground of determination。 Otherwise； how could we compare in respect of magnitude two principles of determination； the ideas of which depe