“God’s purpose in the universe is not only to be infinitely worthy, but to be displayed as infinitely worthy. Our works of love, flowing from faith, are the way Christ-embracing faith shows the value of what it has embraced. The sacrifices of love for the good of others show the all-satisfying worth of Christ as the one whose blood and righteousness establish the fact that God is for us forever.
All the benefits of Christ—all the blessings that flow from God being for us and not against us—rest on the redeeming work of Christ as our Substitute. If God is for us, who can be against us? With this confidence—that God is our omnipotent Father and is committed to working all things together for our everlasting joy in Him—we will love others.
God has so designed and ordered things that invisible faith, which embraces Christ as infinitely worthy, gives rise to acts of love that make the worth of Christ visible. Thus our sacrifices of love do not have any hand in establishing the fact that God is completely for us, now and forever. It’s the reverse: the fact that God is for us establishes our sacrifices of love. If He were not totally for us, we would not persevere in faith and would not therefore be able to make sacrifices of love.”
–John Piper, The Future of Justification: A Response to N.T. Wright (Wheaton, IL: Crossway, 2007), 185.