There is only one thing that can give peace to the conscience, and that is the blood of Jesus Christ sprinkled on it.
A clear understanding that Christ’s death was an actual payment of our debt to God, and that the merit of that death is made over to man when he believes, is the grand secret of inward peace. It meets every craving of conscience. It answers every accusation. It calms every fear.
~ J.C. Ryle
Holiness: Its Nature, Hindrances, Difficulties, and Roots, “Without Christ”, [Moscow, ID: Charles Nolan Publishing, 2001], 308.