τὸ δὲ ποιεῖν ἄνευ νοῦ ἃ δοκεῖ καὶ σὺ ὁμολογεῖς κακὸν εἶναι: ἢ οὔ → but doing what one thinks fit without intelligence is—as you yourself admit, do you not?—an evil
γραμμικῶς: с помощью линий или чертежей, т. е. геометрически (ἀποδείκνυσθαι Sext.).
geométricamente
