Romans 9:1

ἀλήθειαν λέγω ἐν Χριστῷ, οὐ ψεύδομαι. The solemn asseveration is meant to clear him of the suspicion that in preaching to the Gentiles he is animated by hostility or even indifference to the Jews. Yet cf. 2 Corinthians 11:31; Galatians 1:20. ἐν Χριστῷ means that he speaks in fellowship with Christ, so that false-hood is impossible. For συμμαρτ. cf. Romans 2:15; Romans 8:16. The μοι is governed by συν : conscience attests what he says, and that ἐν πνεύματι ἁγίῳ the spirit of God, in which all the functions of the Christian life are carried on: so that assurance is made doubly and trebly sure.