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.)
calmly: P. and V. ἡσυχῆ, ἡσύχως (rare P.), Ar. and V. ἀτρέμα (rare P.), Ar. and P. ἀτρέμας.
peacefully, without care: P. and V. ἀπραγμόνως (Eur., Fragment).