Marcus Tullius Cicero, answered from the texts and cited to the page.
There are three styles — plain, middle, grand — and the orator worth the name commands all three and knows which the occasion requires. The Atticists have taken one, and the thinnest, and called their poverty a principle.1234
' The latter,' you will say, ' bears the highest price. Very probably; but when it has too much age, it has lost that delicious flavor which pleases the palate, and, in my opinion, is scarcely tolerable. ' AYould you choose, then, when you have a mind to regale yourself, to apply to a fresh, unripened cask V By no means; but still there is a certain age when good wine arrives at its utmost perfection.On Oratory and Orators, p. 352
For capital causes require one style of speaking, private and inferior causes another; deliberations require one kind of oratory, panegyric another, judicial proceedings another, common conversation another, consolation another, reproof another, disputation another, historical narrative another.On Oratory and Orators, p. 255
And in doing this (if at least we can manage even this, for it is a mighty undertaking) let us imitate, if we can, Lysias, and especially his simplicity of style: for in many places he rises to grandeur.Orations Vol 4
And he must spare friendships and dignities. He will avoid such insults as are not to be healed; he will only aim at his adversaries, and not even always at them, nor at all of them, nor in every manner.Orations Vol 4
Defended with some heat, because the attack was personal and came from men I liked.