Plato, Epinomis 989e

πειρώμεθα δὴ τῷ τε λόγῳ διεξελθεῖν ἅ τʼ ἐστὶν καὶ οἷα καὶ ὡς δεῖ μανθάνειν, κατὰ δύναμιν τήν τʼ ἐμὴν τοῦ λέγοντος

Let us try, then, to set forth in our statement what things these are, and of what kind, and how one should learn—so far as our ability permits both me the speaker and those who are able to hearken—