Concord: Article VI: Of New Obedience

Also they teach that this faith is bound to bring forth good fruits, and that it is necessary to do good works commanded by God, because of God's will, but that we should not rely on those works to merit justification before God. For remission of sins and justification is apprehended by faith, as also the voice of Christ attests: When ye shall have done all these things, say: We are unprofitable servants. Luke 17, 10 . The same is also taught by the Fathers. For Ambrose says: It is ordained of God that he who believes in Christ is saved, freely receiving remission of sins, without works, by faith alone.