Romans 16:19

ἡ γὰρ ὑμῶν ὑπακοὴ : What is the connection? “I give this exhortation, separating you altogether from the false teachers, and from those who are liable to be misled by them; for your obedience (ὑμῶν emphasised by position) has come abroad to all men. (Cf. Romans 1:8.) Over you therefore I rejoice, but,” etc. He expresses his confidence in them, but at the same time conveys the feeling of his anxiety. For χαίρειν ἐπὶ see 1Co 13:6; 1 Corinthians 16:17. σοφοὺς μὲν εἶναι εἰς τὸ ἀγαθὸν, ἀκεραίους δὲ εἰς τὸ κακόν. For ἀκέραιος see Matthew 10:16; Philippians 2:15, and Trench, Syn [41], § lvi., where there is a full discussion and comparison with ἄκακος. The fundamental idea of the word is that of freedom from alien or disturbing elements. What Paul here wishes for the Romans moral intelligence, not impaired in the least by any dealings with evil does suggest that antinomianism was the peril to be guarded against. Integrity of the moral nature is the best security: the seductive teaching is instinctively repelled.

[41] synonym, synonymous.