Joy in Christ!
This is the confidence of Christians and the joyousness of our conscience: that through faith our sins become, not ours but Christ's, upon whom God laid the sins of us all and who bore our sins (Is 53:6)...All the righteousness of Christ, in turn, becomes ours. He places His hand upon us, and it is well with us; He, the Savior, blessed forever, spreads His garment and covers us. Amen.
(What Luther Says - p. 691 - para 2143)