ἑὰν δὲ προσποιούμενος ᾗ τὰ μαθήματά πως ἀπείρως προβάλλων, οὐκ ἔστιν αἰτίας ἔξω → But should one profess knowledge as he puts forward something in an inexperienced way, he is not without blame (Pappus 3.1.30.31f.)
secure: P. and V. βέβαιος, ἀσφαλής, V. ἔμπεδος.
lasting long: P. and V. χρόνιος.
