He Who Knew No Sin Was Made Sin For You

God made him who knew no sin to be sin for us, so that in him we might become the righteousness of God. 2 Corinthians 5:21

When you are made aware of your sin and frightened by it, you must not allow the sin to remain in your conscience. This would only lead to despair. Rather, just as your awareness of sin flowed from Christ, so you must pour your sin back on him to free your conscience.

So be careful you don't become like the misguided people who allow their sin to bite ate them and eat at their hearts. They strive to rid themselves of this sin by running around doing good works. But you have a way to get rid of your sins. You throw your sins on Christ when you firmly believe that Christ's wounds and suffering carried and paid for your sins. If you try to deal with your sin in your conscience, let it remain there, and continue to look at it in heart, your sins will become too strong for you. They will seem to live forever. But when you think of your sins as being on Christ and boldly believe that he conquered them through his resurrection, then they are dead and gone. Sin can't remain on Christ. His resurrection swallowed up sin and death.
Faith Alone by Martin Luther