Plato, Laws 688d

ἀνθρωπίνων πραγμάτων ἀμαθίᾳ. ταῦτʼ οὖν ὡς οὕτω γέγονε περὶ τὰ τότε, καὶ νῦν, εἴ που, γίγνεται, καὶ ἐς τὸν ἔπειτα χρόνον οὐκ ἄλλως συμβήσεται, ἐὰν βούλησθε, πειράσομαι ἰὼν κατὰ τὸν ἑξῆς λόγον ἀνευρίσκειν τε καὶ ὑμῖν δηλοῦν κατὰ δύναμιν ὡς οὖσιν φίλοις. λόγῳ μὲν τοίνυν σε, ὦ ξένε, ἐπαινεῖν ἐπαχθέστερον, ἔργῳ δὲ σφόδρα ἐπαινεσόμεθα· προθύμως γὰρ τοῖς λεγομένοις ἐπακολουθήσομεν, ἐν οἷς ὅ γε ἐλεύθερος ἐπαινῶν καὶ μὴ μάλιστʼ ἐστὶν καταφανής.

whenever such events occur, and will be so likewise in the future,—this, with your permission, I will endeavor to discover in the course of the coming argument, and to make it as clear as I can to you, my very good friends. Verbal compliments are in poor taste, Stranger; but by deed, if not by word, we shall pay you the highest of compliments by attending eagerly to your discourse; and that is what best shows whether compliments are spontaneous or the reverse. Capital, Clinias! Let us do just as you say.