QUESTION
Is the change from ἐκ to διὰ theologically significant or just stylistic? I’m assuming the latter
Romans 3:30
εἴπερ εἷς ὁ θεὸς ὃς δικαιώσει περιτομὴν ἐκ πίστεως καὶ ἀκροβυστίαν διὰ τῆς πίστεως.
Response
Agreed. Parallel. However, another way to look at it is with this variation Paul gets to assert both causalities both ways, that God makes the uncircumcised righteous through their faithfulness and declares them righteous because of their faith and the same for the circumcision.