The Importance of Clarity: Philostratus, Discourse 1

“Clarity is a good rule for all speech, but especially for a letter. Regardless of whether we are assenting or begging, relenting or not, laying blame or defending, or even in love, we persuade more easily if we explain ourselves clearly. We will explain ourselves clearly and without being vulgar if we phrase common sentiments uniquely and new thoughts in familiar ways.”

… σαφήνεια δὲ ἀγαθὴ μὲν ἡγεμὼν ἅπαντος λόγου, μάλιστα δὲ ἐπιστολῆς· καὶ γὰρ διδόντες καὶ δεόμενοι καὶ ξυγχωροῦντες καὶ μὴ καὶ καθαπτόμενοι καὶ ἀπολογούμενοι καὶ ἐρῶντες ῥᾷον πείσομεν, ἢν σαφῶς ἑρμηνεύσωμεν· σαφῶς δὲ ἑρμηνεύσομεν καὶ ἔξω εὐτελείας, ἢν τῶν νοηθέντων τὰ μὲν κοινὰ καινῶς φράσωμεν, τὰ δὲ καινὰ κοινῶς.