Plutarch Quaestiones Convivales 9.14.1

[1] THIS discourse ended, we poured out our offerings to the Muses, and together with a hymn in honor of Apollo, the patron of the Muses, we sung with Erato, who played upon the harp, the generation of the Muses out of Hesiod. After the song was done, Herod the rhetorician said: Pray, sirs, hearken. Those that will not admit Calliope to be ours say that she keeps company with kings, not such, I suppose, as are busied in resolving syllogisms or disputing, but such who do those things that belong to rhetoricians and statesmen. But of the rest of the Muses, Clio abets encomiums, for praises are called κλέα; and Polymnia history, for her name signifies the remembrance of many things; and it is said that all the Muses were somewhere called Remembrances. And for my part, I think Euterpe hath some relation to us too, if (as Chrysippus says) her lot be agreeableness in discourse and pleasantness in conversation. For it belongs to an orator to converse, as well as plead or give advice; since it is his part to gain the favor of his auditors, and to defend or excuse his client. To praise or dispraise is the commonest theme; and if we manage this artfully, it will turn to considerable account; if unskilfully, we are lost. For that saying, chiefly, in my opinion, belongs to those men who have a pleasing and persuasive faculty in discourse.