Plato, Laws 684c

καὶ μὴν τοῦτό γε οἱ πολλοὶ προστάττουσιν τοῖς νομοθέταις, ὅπως τοιούτους θήσουσιν τοὺς νόμους οὓς ἑκόντες οἱ δῆμοι καὶ τὰ πλήθη δέξονται, καθάπερ ἂν εἴ τις γυμνασταῖς ἢ ἰατροῖς προστάττοι μεθʼ ἡδονῆς θεραπεύειν τε καὶ ἰᾶσθαι τὰ θεραπευόμενα σώματα. παντάπασι μὲν οὖν. τὸ δέ γʼ ἐστὶν ἀγαπητὸν πολλάκις εἰ καί τις μετὰ λύπης μὴ μεγάλης δύναιτο εὐεκτικά τε καὶ ὑγιῆ σώματα ἀπεργάζεσθαι. τί μήν;

that the lawgivers shall enact laws of such a kind that the masses of the people accept them willingly; just as one might insist that trainers or doctors should make their treatments or cures of men’s bodies pleasurable. Exactly so. But in fact one often has to be content if one can bring a body into a sound and healthy state with no great amount of pain. Very true.