Plutarch, Table Talk 662 c-d
“For we can use pain as an instrument in healing only briefly since it is extremely violent. No one would be able to expel pleasure from the rest of the approaches, even if he wanted too—for this is present in eating, sleeping and also in baths, massages, and relaxation, and they help someone who is sick by wearing away what is foreign to the body with what is familiar and natural.
What kind of pain, what deprivation, or what toxin as easily and directly addresses a disease as when a bath happens at the right time or when wine is given to those who need it? Even food when it has arrived with pleasure immediately resolves all difficulties and sets everything right as when a clear day develops from a storm…”
“σμικρὰ γάρ,” ἔφη, “καὶ ἄκοντες ὡς βιαιοτάτῳ τῶν ὀργάνων ἀλγηδόνι προσχρώμεθα· τῶν δ᾿ ἄλλων οὐδεὶς ἂν οὐδὲ βουλόμενος ἀπώσαιτο τὴν ἡδονήν, ἀλλὰ καὶ τροφαῖς καὶ ὕπνοις καὶ περὶ λουτρὰ καὶ ἀλείμματα καὶ κατακλίσεις ἀεὶ πάρεστιν καὶ συνεκδέχεται καὶ συνεκτιθηνεῖται τὸν κάμνοντα, πολλῷ τῷ οἰκείῳ καὶ κατὰ φύσιν ἐξαμαυροῦσα τὸ ἀλλότριον. ποία γὰρ ἀλγηδών, τίς ἔνδεια, ποῖον δηλητήριον οὕτω ῥᾳδίως καὶ ἀφελῶς νόσον ἔλυσεν, ὡς λουτρὸν ἐν καιρῷ γενόμενον καὶ οἶνος δοθεὶς δεομένοις; καὶ τροφὴ παρελθοῦσα μεθ᾿ ἡδονῆς εὐθὺς ἔλυσε τὰ δυσχερῆ πάντα καὶ κατέστησεν εἰς τὸ οἰκεῖον τὴν φύσιν, ὥσπερ εὐδίας καὶ γαλήνης γενομένης