Philo Judaeus De Agricultura 142

And although the intellect, when it has sharpened itself so as to render itself more acute than before (as a physician gives strength to bodies), dissects the natures of things, but yet derives no advantage with respect to the acquisition of virtue; it will divide the hoof, being able to divide, and to distinguish, and to discriminate between each separate thing; but it will not chew the cud so as to avail itself of any useful food which may be able, by means of its recollections, to soften the asperity of the soul which has been engendered by sins, and to produce a really gentle and pleasant motion.