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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Christ urges us to love our neighbor as He loved us, forgiving all of their sins - giving them the absolving, shirt-pulling, embrace that we would also want.
I am not a good Lutheran. I have only been around reformation theology for a few years.