Pier Paolo Vergerio,
de Ingenuis Moribus et Liberalibus Adulescentiae Studiis (§2):
But while it is right that all people (especially parents) should be such as to seek to educate their children properly and since it is fitting that children should be such that they seem worthy of good parents, yet it is especially true for those who occupy a lofty place in society, whose every saying and deed is exposed to the public eye, that they should be educated in the most important subjects, so that they can be considered worthy of the fortune and rank of dignity which they achieve. It is only fair that those who think that all the best is owed to them should be examples of the best themselves. Nor is there any more sure or stable principle of ruling than that those who get hold of power should be judged by all to be the most worthy of it.
Verum cum omnes homines deceat (parentes quidem in primis) eos esse qui recte erudire suos liberos studeant et filios deinde tales qui parentibus bonis digni videri possint, praecipue tamen qui excelsiore loco sunt, quorumque nihil neque dictum neque factum latere potest, decens est ita principalibus artibus instructos esse, ut et fortuna et gradu dignitatis quam obtinent digni habeantur. Aequum est enim qui sibi summa omnia deberi volunt, debere et eos summa omnia de se praestare. Nec est ulla certior aut stabilior regnandi ratio quam si hi qui regna obtinent, ab omnibus dignissimi omnium regno iudicentur.