It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life. – John 6:63

Religion, and the truth of it, is not to be learnt by the head. Years of reading, hours of assiduous study, will never make a man a Christian. “It is the Spirit that quickeneth; the flesh profiteth nothing.” Oh! art thou destitute of the Spirit of the living God? For oh! I charge thee to remember this my hearer: if in thy soul mysterious and supernatural influence of the Holy Spirit has never been shed abroad, thou art an utter stranger to all the things of God. The promises are not thine; heaven is not thine, thou art on thy road to the land of the dead, to the region of the corpse, where their worm dieth not, and their fire is not quenched. Oh that the Spirit of God may rest upon you now! Bethink you, you are absolutely dependent upon His influence. You are in God’s hand today to be saved or to be lost-not in your own hands, but in His. You are dead in sins; unless He quickens you, you must remain so. The moth beneath your finger is not more absolutely at your mercy than you are now at the mercy of God. Let Him but will to leave you as you are, and you are lost; but oh! if mercy speaks and says, “Let that man live,” you are saved. I would that you could feel the weight of this tremendous doctrine of sovereignty. It is like the hammer of Thor, it may shake your heart however stout it be, and make your rocky soul tremble to its base.

“Life, death, and hell, and worlds unknown,
Hang on His firm decree.”

Yield to the sovereignty of the Holy Ghost; and He shall assuredly prove to you that, in that very yielding, there was a proof that He had loved you; for He made you yield; He made you willing to bow before Him in the day of His power. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0315.cfm