Plutarch, Quaestiones Convivales, book 4, chapter 0 8:

ὁ γὰρ σύνδειπνοσ οὐκ ὄψου καὶ οἴνου καὶ τραγημάτων μόνον, ἀλλὰ καὶ λόγων κοινωνὸσ ἣκει καὶ παιδιᾶσ καὶ φιλοφροσύνησ εἰσ εὔνοιαν τελευτώσησ.