Ars Rhetorica

πᾶς δὲ λόγος ἐστὶ δῆλον ὅτι ἐν ἐπινοήμασι καὶ ἐν ἀπαγγελίᾳ, ἥτις ἐστὶν ἐν λέξει, ἐν σχήματι, ἐν ῥυθμῷ. ἔστιν οὖν ῥητέον τίνα ἐστὶ τὰ διακρίσεις ποιοῦντα ἀπὸ τῶν πολιτικῶν τοῖς ἀφελέσι λόγοις· οὐ γὰρ τὰ αὐτά ἐστιν ἐννοήματα τῶν τε ἀφελῶν καὶ τῶν πολιτικῶν. εἰ γὰρ ἐννόημα τὸ αὐτό, ἀλλὰ λέξις οὐχ ἡ αὐτή, ἢ εἰ καὶ λέξις ἡ αὐτή, ἀλλʼ οὐχ ὁ ῥυθμὸς ὁ αὐτός, ἢ εἰ καὶ ῥυθμὸς ὁ αὐτός, ἀλλʼ οὐ τὸ σχῆμα τὸ αὐτό.