C. S. Lewis wrote,
"Until quite modern times all teachers and even all men believed the universe to be such that certain emotional reactions on our part could be either congruous or incongruous to it—believed, in fact, that objects did not merely receive, but could merit, our approval or disapproval, our reverence or our contempt...
"'Can you be righteous', asks Traherne, 'unless you be just in rendering to things their due esteem? All things were made to be yours and you were made to prize them according to their value.'
"St Augustine defines virtue as ordo amoris, the ordinate condition of the affections in which every object is accorded that kind of degree of love which is appropriate to it. Aristotle says that the aim of education is to make the pupil like and dislike what he ought. When the age for reflective thought comes, the pupil who has been thus trained in 'ordinate affections' or 'just sentiments' will easily find the first principles in Ethics; but to the corrupt man they will never be visible at all and he can make no progress in that science.
"Plato before him had said the same. The little human animal will not at first have the right responses. It must be trained to feel pleasure, liking, disgust, and hatred at those things which really are pleasant, likeable, disgusting and hateful. In the Republic, the well-nurtured youth is one 'who would see most clearly whatever was amiss in ill-made works of man or ill-grown works of nature, and with a just distaste would blame and hate the ugly even from his earliest years and would give delighted praise to beauty, receiving it into his soul and being nourished by it, so that he becomes a man of gentle heart."