18. ὁ γὰρ ἐν τούτῳ κ.τ.λ. Cf. Rom 15:3, the service of the Christ involves the adoption of His principle of ‘not pleasing Himself.’
ἐν τούτῳ = in this matter, of conduct as regards things in themselves indifferent.
δουλεύων τῷ χρ. This is the true service of the Christ (the Messiah) in contrast with pretended services; cf. Hort, Eccl., p. 111; cf. below Rom 15:3-4.
δόκιμος τοῖς ἀν. Contrasted with μὴ βλασφημ. ὑ. τὸ ἀγαθόν: men will not be able to find fault.