From the Critique of Practical Reason
IF with Epicurus we make virtue determine the will only by means of the pleasure it promises, we cannot afterwards blame him for holding that this pleasure is of the same kind as those of the coarsest senses. For we have no reason whatever to charge him with holding that the ideas by which this feeling is excited in us belong merely to the bodily senses. As far as can be conjectured, he sought the source of many of them in the use of the higher cognitive faculty, but this did not prevent him, and could not prevent him, from holding on the principle above stated, that the pleasure itself which those intellectual ideas give us, and by which alone they can determine the will, is just of the same kind. Consistency is the highest obligation of a philosopher, and yet the most rarely found. The ancient Greek schools give us more examples of it than we find in our syncretistic age, in which a certain shallow and dishonest system of compromise of contradictory principles is devised, because it commends itself better to a public which is content to know something of everything and nothing thoroughly, so as to please every party.
Cf. Augustine, Socrates fought foolishness, Plato perfected philosophy Hugh of St. Victor, Learn gladly from everyone Erasmus, Folly's lineage, education and companions Emerson, When the Gods come among men Valery, Perfection dans tous les ordres Whitehead, Wide opportunities for experience Papacy
Reference address : https://www.ellopos.net/elpenor/greeks-us/kant-consistency.asp