Heidelberg Catechism – Lord’s Day 21
Question 55. What dost thou understand by the communion of saints?
First, that believers, all and every one, as members of Christ have part in Him and in all His treasures and gifts; secondly, that each one must feel himself bound to use his gifts, readily and cheerfully, for the advantage and welfare of other members.
Question 56. What dost thou believe concerning the forgiveness of sins?
That God, for the sake of Christ’s satisfaction, will no more remember my sins, neither the sinful nature with which I have to struggle all my life long; but graciously imparts to me the righteousness of Christ, that I may nevermore come into condemnation.