סְגֻלָּה

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

English (Strong)

feminine passive participle of an unused root meaning to shut up; wealth (as closely shut up): jewel, peculiar (treasure), proper good, special.