They [the Jews] said therefore to [Jesus], “What shall we do, that we may work the works of God?” Jesus answered and said to them, “This is the work of God, that you believe in Him whom He sent.”
John Calvin comments: “First, it is clear enough that Christ is not speaking literally when he calls faith a ‘work,’ in the same way that Paul compares the law of faith with the law of works (see Romans 3:27).” (John Calvin: The Crossway Classic Commentaries, p.156, emphasis mine)
I completely agree. Jesus is not talking about the works of the Law. Jesus is refocusing them on the kind of work that God now demands of them, which is merely the work of their ancestor Abraham:
Romans 4:5: “But to the one who does not work, but believes in Him who justifies the ungodly, his faith is credited as righteousness.”
Galatians 2:16: “Knowing that a man is not justified by the works of the Law but through faith in Christ Jesus, even we have believed in Christ Jesus, so that we may be justified by faith in Christ and not by the works of the Law; since by the works of the Law no flesh will be justified.”
One person comments: “I got the implication that they mean that God’s work is to give them saving faith.”
However, John Calvin explains:
Calvin comments: “They had spoken about ‘works.’ Christ reminds them about one ‘work’--that is, faith, by which he means that everything that men do without faith is in vain and useless. Only faith is enough, because God requires that we ‘believe.’ There is an implied contrast here between ‘faith’ and the ‘works’ and efforts of men. It is as if Christ had said, ‘Men work to no purpose when they try to please God without faith, because they are running off-course and do not go towards the finishing post.’ This is a remarkable passage, since it shows that even if men strain themselves throughout their lives, they achieve nothing if they do not have faith in Christ as the rule of their life. People who infer from this passage that faith is God’s gift are mistaken, for Christ does not show here what God produces in us, but what God wants and requires from us.” (John Calvin: The Crossway Classic Commentaries, pp.155-156, emphasis mine)
Exactly. Jesus is answering their question about what they must do, what God wants from them. This is good because some Calvinists do infer what Calvin describes as “mistaken”:
One Calvinist paraphrase: “They [the Jews] said therefore to [Jesus], ‘What shall we do, that we may work the works of God?’ Jesus answered and said to them, [‘You cannot. God works to put faith in you so that you believe in Him whom He sent’].”
So Calvin correctly points out that this isn’t talking about what God produces in us, but what He expects of us.