“For from days of old no one has heard, nor has ear perceived, Nor has the eye seen a God besides You, Who works and acts in behalf of the one who [gladly] waits for Him.” Isaiah 64:4 AMP
God has placed Himself under the law of prayer and has obligated Himself to answer prayer. Prayer moves God to do works among people but in His own way of course.
Prayer makes God work in all the things prayed for. While man in his weakness waits, trusts, thanks, worship and prays, God undertakes the work.
Jesus commits Himself to the force of prayer “Whatever you ask in My name, that I will do, that the Father may be glorified in the Son. If you ask anything in My name, I will do it.” (John 14:13-14)
“If you abide in Me, and My words abide in you, you will ask what you desire, and it shall be done for you.” John 15:7 NKJV
Prayer makes God work in the affairs of men.
Blessings!