Could it be that many of our problems with prayer and much of our weakness in prayer come from the fact that we are not all on active duty, and yet we still try to use the transmitter? We have taken a wartime walkie-talkie and tried to turn it into a civilian intercom to call the servants for another cushion in the den… We see repeatedly in Scripture (Mt. 9:38; Lk. 21:34-36; Rom. 15:30-31; Eph. 6:12, 17-19; Col. 4:3; 2 Thes. 3:1) that prayer is a walkie-talkie for warfare, not a domestic intercom for increasing our conveniences.
John Piper