Fasting is not a no to the goodness of food or the generosity of God in providing it. Rather, it is a way of saying, from time to time, that having more of the Giver surpasses having the gift. If a husband and wife resolve to give up sexual relations for a season to deal earnestly with a problem keeping them at odds, this is not a condemnation of sex but an exaltation of love. Food is good. But God is better. Normally we meet God in his good gifts and turn every enjoyment into worship with thanksgiving. But from time to time we need to test ourselves to see if we have begun to love his gifts in place of God.

–John Piper, A Hunger for God: Desiring God through Fasting and Prayer.

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