Here are a few thoughts from John Piper on this passage. Think on these things!
So the gospel of grace (Acts 20:24) is what we preach to unbelievers, and the gospel of grace is what we preach to believers. That is what Paul says in Romans 1:15. “I am eager to preach the gospel to you [believers!] also who are in Rome.” Not to get them saved, but to keep them saved through sanctification. Our faith feeds off the good news of the grace of God. And our obedience feeds off of faith. Therefore, to bring about the obedience of faith, we must hear the gospel of grace again and again.
So here is the sum of the matter: grace came to us absolutely free and unconditional from God when he called us to himself and loved us as his own (1:6-7). This grace makes us debtors to everyone who, like us, needs grace, because not to share the grace we received would imply that we qualified for it and they don’t; and that would nullify grace. And what we share is the gospel of this great free grace. This is how we pay our debt to others: freely we received, freely we give. And one of the ways we share the good news of God’s grace is through spiritual gifts. O, how important is the body life of the church in small groups where people understand that every member is a steward of grace to bring about the obedience of faith for the sake of the Name.