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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In the face of all the misunderstandings on the part of the world and all the errors which have arisen within Christendom, let us make this point absolutely clear: the task of the church in the world consists uniquely and alone in the preaching of the Word of God and in administering the Sacrament.