πρόφανσις
From LSJ
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
Greek (Liddell-Scott)
πρόφανσις: -εως, ἡ, ἀντὶ πρόφασις, Σοφ. Τρ. 262, ἐξ εἰκασίας τοῦ Δινδ., ἴδε σημ. Jebb ἐν τόπῳ, πρβλ. καὶ Εὐστ. Πονημ. 96. 18.