John Piper: “So how is this good news – that the righteousness of God is revealed in the gospel [Rom1.17]? Here’s the answer: God demands righteousness and we don’t have it, so the only hope for us is that God himself would give the righteousness that he demands. That would be good news. That would be gospel. And that is what he does. What is revealed in the gospel is the righteousness of God for us that he demands from us. The reason the gospel is the power of God for salvation – the way that the gospel saves believers is that in it God reveals a righteousness for us that God demands from us. What we had to have, but could not create or supply or perform, God gives us freely, namely, his own righteousness, the righteousness of God.