The third question [of pure reason]: 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 knowledge of things and the law of nature. ... Happiness is the satisfaction of all our desires ... that law, assuming such to exist, which has no other motive than the worthiness of being happy, I term a moral or ethical law.
Published before 1923