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Prayer is nothing but the promise reversed, or God's Word formed into an argument, and retorted by faith upon God again.

William Gurnall (1821). “The Christian in Complete Armour: Or, A Treatise on the Saints' War with the Devil, Wherein a Discovery is Made of the Policy, Power, Wickedness, and Stratagems Made Use of by that Enemy of God and His People : a Magazine Opened, from Whence the Christian is Furnished with Spiritual Arms for the Battle, Assisted in Buckling on His Armour, and Taught the Use of His Weapons, Together with the Happy Issue of the Whole War”, p.135
Prayer is nothing but the promise reversed, or God's Word formed into an argument, and retorted by faith upon God again.