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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The following is an excerpt from “A Year of Grace: Collected Sermons of Advent through Pentecost” written by Bo Giertz and translated by Bror Erickson (1517 Publishing, 2019).
While most of his letters were written as semi-private counsel and consolation, some, like the “Letter to the Christians of Miltenburg” were written openly for public consumption.
For Luther, Jesus does something much better for those who grieve than simply identify with them: He brings suffering and evil to an end in His own death.
I heartily sympathize with you and earnestly pray our Lord Jesus Christ to strengthen you and give you a cheerful heart. I should like to know, and am making diligent inquiries to find out, what your trouble may be or what has caused your breakdown.
As usual, Luther took what he received and turned it inside-out, so that it shifted from a series of demands and became a bestowal of God’s gracious promise.
We can take comfort in the knowledge that He kills the sinner so we can get a new shot at life and life eternal.
At the core of Luther’s advice is the proclamation that we are free to hand over our pain, our sin, and our inabilities to our Savior.
When orthodoxy becomes a Law, heterodoxy can feel like the Gospel.
We're going to worry about what people think of us. It's going to get in the way of our relationship with Jesus. We're going to fear God's judgment. But, we're also baptized into Christ. So we don't give up hope. Jesus will help us and strengthen us. He will guide us in his Baptismal grace and peace.
We do not, as followers of Jesus, put any hope or place any trust in “princes, in mortal man, in whom there is no salvation” (Ps. 146:3).
If man can save himself, what need is there for the cross or the Gospel?
We would rather be God ourselves. But, being God is always beyond our grasp.