What belongs to duty here is only the endeavour to realize and promote the summum bonum in the world, the possibility of which can therefore be postulated; and as our reason finds it not conceivable except on the supposition of a supreme intelligence, the admission of this existence is therefore connected with the consciousness of our duty, although the admission itself belongs to the domain of speculative reason. Considered in respect of this alone, as a principle of explanation, it may be called a hypothesis, but in reference to the intelligibility of an object given us by the moral law (the summum bonum), and consequently of a requirement for practical purposes, it may be called faith, that is to say a pure rational faith, since pure reason (both in its theoretical and practical use) is the sole source from which it springs.
Betebeharrari hemen munduan ongi gorena sortzeko eta sustatzeko behar den lana baino ez dagokio, zeinaren ahalgarritasuna beraz postula daitekeen, baina gure arrazoimenak ez duen pentsagarri aurkitzen, adimendu goren bat onartuz ez bada, zeinaren izatea onartzea, beraz, gure betebeharraren kontzientziarekin lotzen den, nahiz eta onarpen hori arrazoimen teoretikoari dagokion, eta horri dagokionez hura argibide-oinarri gisa hartuta hipotesia den, baina guri lege moralaren bidez ezarri zaigun objektu baten ulergarritasunarekin harremanean (ongi gorenarekin), eta beraz, asmo praktikoa duen premia batekin, hura sinesmen eta gainera arrazoimen-sinesmen huts dei daiteke, zeren arrazoimen hutsa baino ez baita haren iturria (erabilera teoretikoan nahiz praktikoan).