What then is new about the new Christian fasting? What’s new about Christian fasting is that it rests on all this finished work of the Bridegroom. It assumes that. It believes that. It enjoys that. The aching and yearning and longing for Christ and his power that drive us to fasting are not the expression of emptiness. Need, yes. Pain, yes. Hunger for God, yes. But not emptiness. The firstfruits of what we long for have already come. The downpayment of what we yearn for is already paid. The fullness that we are longing for and fasting for has appeared in history, and we have beheld his glory. It is not merely future. We do not fast out of emptiness. Christ is already in us the hope of glory (Colossians 1:27). We have been “sealed . . . with the Holy Spirit of promise, who is given [now!] as a pledge of our inheritance” (Ephesians 1:13-14; see also 2 Corinthians 1:22; 5:5). – John Piper, A Hunger for God, 41-41