Augustine of Hippo

Paul was speaking here of the way wages are given. But God gave by grace, because he gave to sinners so that by faith they might live justly, that is, do good works. Thus the good works which we do after we have received grace are not to be attributed to us but rather to him who has justified us by his grace. For if God had wanted to give us our due reward, he would have given us the punishment due to sinners.