περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
P. and V. καθαρός, ἀκέραιος, ἀκήρατος (rare P.), ἁγνός (rare P.), V. ἀκραιφνής, ἄθικτος; see pure.
be uncontaminated, v.: P. and V. ἁγνεύειν, Ar. and P. καθαρεύειν.