“Lesson: The suffering of Christ was an expiatory sacrifice for our sins.
This is what is said in the text [1 Peter 3:18] that He suffered for sins [and] for the unjust, that is, He had the strength to snatch away from us the penalty, the guilt and stain of sin, and acquiring for us the the favor of God, righteousness, and eternal life. The same thing is what is customarily signified [as] accomplished by Christ through the [terms] satisfaction, merit, redemption, and restoration.
Uses of this doctrine:
Use 1: For consolation towards the faithful against all the guilt of sin, and the terrors of conscience that may arise from that source. For in Christ and His suffering we have the remedy prepared against all those different kinds of death-bringing wounds.
Use 2: For admonition so that we may abhor all sin as from those things which inflicted death to our Savior, and would have brought [death] upon us a thousand times over unless He had turned it away.”
- excerpt from 1635 edition of Catecheseos Christianae Sciagraphia, Dominica XV, Doct. 3.