According to castiglione, what should the renaissance man avoid

Count Baldassare Castiglione was a 16th Century Italian diplomat who combined the Greek ideal of a man who ought to be "well-rounded" with Renaissance ideals. He notes that the Renaissance man should avoid using antiquated or unfamiliar words. He is expected to use vocabulary from familiar Italian words ''that have some grace in pronunciation", the Rennaisence mans knowledge, rather than his diction, that will be ultimately important.