Jesus is offering a peace that is a settled sense of well-being and security. Paul tells us that we have peace with God because we have been justified by faith. It's possible because Christ paid for our sin and credited His goodness to our account. This is grace . . We must have faith.
Faith is active belief . . . .
True faith believes in Christ's promise of eternal life enough to rest in Him for our eternal hope and follow Him in our daily living. Our past is dealt with. The sins of the past are forgiven. We are free from the stupidity and rebellion of the way we used to live. Our failures are overcome.