Who through faith subdued kingdoms, wrought righteousness, obtained promises, stopped the mouths of lions, quenched the violence of fire, escaped the edge of the sword, out of weakness were made strong, waxed valiant in fight, turned to flight the armies of the aliens. – 11:33,34

Can you pray, my brother? If you know how to pray, you can move heaven and earth. Can you pray, my brother? Then you can set almighty forces in operation. You can suffer no need, for everlasting supplies await the hand of prayer: “Ask, and it shall be given you.” You cannot miss your way, for you shall be guided in answer to prayer. You shall hear a voice behind you, saying, “This is the way, walk ye in it.” “O sir,” you say, “I cannot pray prevailingly.” Then you are not like Jacob, good at wrestling. You cannot take hold upon the angel, and win the victory. Do you feel in prayer as if the sinew of your strength were shrunk, and your knee out of joint? Well, then, let me bring the text before you. Out of this weakness in prayer you can only be made strong by faith. Believe in God, and you will prevail with God. Believe in His promise, and plead it. Believe in His Spirit, and pray by His help. Believe in Jesus, who makes intercession; for through Him you may come boldly to the throne of grace. Faith alone can confirm feeble knees. “According to your faith be it unto you.”…Seek faith to become Masters of the Art of prayer. I would rather be Master of the Art of prayer than M.A. of both universities. He who knows how to pray has his hand on a leverage which moves the universe. But there is no praying without believing. If thou believest not, thou mayest be heard-it is more than I can promise thee; but if thou believest, thou shalt be heard, for God refuses no believing prayer. To refuse to keep His own promise when it is pleaded would be to falsify His word, and change His character; and neither of these things can ever be. Have thou strong confidence: “He that spared not His own Son, but delivered Him up for us all, how shall He not with Him also freely give us all things?” Jesus said, “If ye then, being evil, know how to give good gifts unto your children, how much more shall your Father which is in heaven give good things to them that ask Him?” Believe in prayer, and you will pray believingly. Some do not think that there is much in prayer. Poor souls! The Lord teach them better! O my brothers, believe up to the hilt in prayer, and you will find it to be the most remunerative work on earth! He that trades with God in prayer enters upon a business whereof the merchandise is better than silver or gold. Prayer makes us “rich towards God,” and this is the best of riches; but it must be believing prayer. “Let him ask in faith, nothing wavering.” Hast thou a poor, faint heart in this sacred exercise? Be assured that only by faith out of this weakness canst thou be made strong. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2209.cfm