The certainty of faith is utter assurance because it depends upon nothing of your own. It is entirely trusting that God is a propitious, pardoning God—the God who justifies sinners by forgiving them.
Sinners get faith as a gift when Christ takes their captivity captive.

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Here we have the other major theme within Romans: God will have mercy on whom He has mercy, and He will have compassion on whom He has compassion
The doctrinal locus for this Sunday is marriage, which points to the greater marriage of Christ and the church or the marriage of Christ and the believer.