Falsa enim est querela, paucissimis hominibus vim percipiendi quae tradantur esse concessam, plerosque vero laborem ac tempora tarditate ingenii perd… - Quintilian

Nihil enim rerum ipsa natura voluit magnum effici cito, praeposuitque pulcherrimo cuique operi difficultatem: quae nascendi quoque hanc fecerit legem, ut maiora animalia diutius visceribus parentis continerentur.

I do not merely assert that the ideal orator should be a good man, but I affirm that no man can be an orator unless he is a good man. For it is impossible to regard those men as gifted with intelligence who on being offered the choice between the two paths of virtue and of vice choose the latter, nor can we allow them prudence, when by the unforeseen issue of their own actions they render themselves liable not merely to the heaviest penalties of the laws, but to the inevitable torment of an evil conscience.

Qui stultis videri eruditi volunt stulti eruditis videntur.