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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Jesus is thus not only the fulfillment of the Scriptures of Israel; He is their fullness. He fills them with words, people, actions, and institutions that testify of Him.