Ignorance, the root and stem of every evil. - Plato

Imagine that the keeper of a huge, strong beast notices what makes it angry, what it desires, how it has to be approached and handled, the circumstances and the conditions under which it becomes particularly fierce or calm, what provokes its typical cries, and what tones of voice make it gentle or wild. Once he's spent enough time in the creature's company to acquire all this information, he calls it knowledge, forms it into a systematic branch of expertise, and starts to teach it, despite total ignorance, in fact, about which of the creature's attitudes and desires is commendable or deplorable, good or bad, moral or immoral. His usage of all these terms simply conforms to the great beast's attitudes, and he describes things as good or bad according to its likes and dislikes, and can't justify his usage of the terms any further, but describes as right and good the things which are merely indispensable, since he hasn't realised and can't explain to anyone else how vast a gulf there is between necessity and goodness.

This is the end of the web of the statesman’s activity: the direct interweaving of the characters of restrained and courageous men, when the kingly science has drawn them together by friendship and community of sentiment into a common life, and having perfected the most glorious and the best of all textures, clothes with it all the inhabitants of the state, both slaves and freemen, holds them together by this fabric, and omitting nothing which ought to belong to a happy state, rules and watches over them.

"Nor when love is of this disinterested sort is there any disgrace in being deceived, but in every other case there is equal disgrace in being or not being deceived. For he who is gracious to his lover under the impression that he is rich, and is disappointed of his gains because he turns out to be poor, is disgraced all the same: for he has done his best to show that he would give himself up to any one's "uses base" for the sake of money; but this is not honourable. And on the same principle he who gives himself to a lover because he is a good man, and in the hope that he will be improved by his company, shows himself to be virtuous, even though the object of his affection turn out to be a villain, and to have no virtue; and if he is deceived he has committed a noble error. For he has proved that for his part he will do anything for anybody with a view to virtue and improvement, than which there can be nothing nobler."