Q. What do we do that is good? A. Only that which arises out of true faith, conforms to God’s law, and is done for his glory; and not that which is based on what we think is right or on established human tradition. - Heidelberg Catechism, question 91.

That the Lord Jesus having fully reconciled us unto God, through the blood of his cross, it is by virtue of his merits only, and not of our works, that we are absolved and justified in his sight. - A Brief Confession of Faith of the Reformed Churches of Piedmont 1655, Article 16

Shorter Catechism 81 – The Sins Forbidden in the Tenth Commandment #ShorterCatechism