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They came to see that this is what prayer is for. In the words of John Piper, prayer is a “walkie-talkie…for the accomplishment of a wartime mission.” He writes: It is as though the field commander (Jesus) called in the troops, gave them a crucial mission (go and bear fruit), handed each of them a personal transmitter coded to the frequency of the general’s headquarters, and said, “Comrades, the general has a mission for you. He aims to see it accomplished. And to that end he has authorized me to give each of you personal access to him through these transmitters. If you stay true to his mission and seek his victory first, he will always be as close as your transmitter, to give tactical advice and to send air cover when you need it. Then Piper describes how millions of Christians have missed God’s purpose for this walkie-talkie, choosing to “rig it up as an intercom in our houses and cabins and boats and cars—not to call in firepower for conflict with a mortal enemy but to ask for more comforts in the den.”[4] We are wasting the privilege of prayer if we’re not using it for God’s purpose: the spread of his glory among all the nations.
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David Platt (Don't Hold Back: Leaving Behind the American Gospel to Follow Jesus Fully)