Romans 10:3 "For not knowing about God’s righteousness and seeking to establish their own, they did not subject themselves to the righteousness of God."

One Roman Catholic teaching is that the righteousness of God is infused into us or channelled into us by the sacraments thus making us righteous and actually meriting for us God's favor and eternal life.  It's a process that is synergistic, man working with God so that man merits heaven.

But this process is condemned here in Romans 10:3 where those who seek to establish their own righteousness they do not subject or submit themselves to God.  Salvation is not a "we do what we can and God picks up the slack", it is fully of God, a monergistic act rather then a synergistic act.  Otherwise grace is no more grace.