text: Some say: "If one is familiar with upright and honourable dogmas, it will be superfluous to advise him." By no means; for this person has indeed learned to do things which he ought to do; but he does not see with sufficient clearness what these things are. For we are hindered from accomplishing praiseworthy deeds not only by our emotions, but also by want of practice in discovering the demands of a particular situation. Our minds are often under good control, and yet at the same time are inactive and untrained in finding the path of duty, – and advice makes this clear. Again, it is written: "Cast out all false opinions concerning Good and Evil, but replace them with true opinions; then advice will have no function to perform." Order in the soul can doubtless be established in this way; but these are not the only ways. For although we may infer by proofs just what Good and Evil are, nevertheless precepts have their proper rôle. Prudence and justice consist of certain duties; and duties are set in order by precepts. Moreover, judgment as to Good and Evil is itself strengthened by following up our duties, and precepts conduct us to this end. For both are in accord with each other; nor can precepts take the lead unless the duties follow. They observe their natural order; hence precepts clearly come first.