James 3:10

ἐκ τοῦ αὐτοῦ στόματος : This incongruity is often rebuked in Jewish literature; it was the more needed because in earlier days it was not regarded as reprehensible, cf. Proverbs 11:26; Proverbs 24:24; Proverbs 26:2; Proverbs 30:10, etc. εὐλογία καὶ κατάρα : this does not imply a combination of blessing and cursing, as though such a combination were condemned, while either by itself were allowable (Mayor); it simply means that the mouth which blesses God when uttering prayer, curses men at some other times, e.g., during embittered controversy. οὐ χρή : ἅπ. λεγ. in N.T.