Brethren, our faith also, resting upon the doctrines of the gospel and upon the God of the gospel, embraces the power of prayer. We believe in the prevalence of supplication. I am afraid that this belief is going out of fashion in the so-called Christian world. The theory of some is, that prayer is useful to ourselves, but that it cannot be operative upon God; and much is said about the impossibility of the Divine purposes being changed, and the utter unlikelihood of a finite being affecting God by his cries. We also hold that the purposes of God are not changed; but what if prayer be a part of His purpose, and what if He ordains that His people should pray when He intends to give them blessings? Prayer is one of the necessary wheels of the machinery of providence. The offering of prayer is as operative in the affairs of the world, and the production of events, as the rise of dynasties or the fall of nations. We believe that God in very truth hearkens to the voices of men.
Spurgeon, An All-Around Ministry, p. 16.