The effectual fervent prayer of a righteous man availeth much. – James 5:16

Take down the Book, your charter and your Father’s will, and see if there be any part of the charter which promises this good thing (that you ask) to you. When you have found the promise lay your finger on it. Better still, with your spirit grasp it in your hand, and go before God with it. If your prayer be as Luther calls it, “bombarda Christianorum,” the Christian’s great gun with which he doth bombard heaven, then surely the promise is the shot which he sends forth. Plead the promise by saying, “Lord, do as Thou hast said. Fulfil this word unto Thy servant upon which Thou hast caused me to hope.” If you do not seem to prevail with one promise seek out another and plead it. This, perhaps will be more to the point: a promise which your very soul seems to suck in as though it were spoken to you newly and freshly, as if never another man had ever received it. Spread this promise before the Lord. Nothing pleases Him more than seeing His own word pleaded by His own children. Try this, and if it is manifest that you have not succeeded turn to yet another promise, and another and another and another, and then plead, “For Thy name’s sake, for Thy truth’s sake, for Thy covenant’s sake”; and then came in with the greatest plea of all, “For Jesus’ sake and in His name, for the blood’s sake, I plead with Thee, my God. O Thou that hearest prayer, wilt Thou not keep touch with Thine own word, and be true to Thine own Son?” You have prevailed there. By that sign you have conquered. Again it shall be seen that the Lord hath hearkened to the voice of a man. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1480.cfm