But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of His.  – Romans 8:9

At this present hour, if you are without Christ, you lack the very essence of good, by reason of which your choicest privileges are an empty boast, instead of a substantial boon. Without Christ all the ordinances and means of grace are worth nothing. Even this precious Book, that might be weighed with diamonds, and he that was wise would choose the Book, and leave the precious stones-even this sacred volume is of no benefit to you. You may have Bibles in your houses, as I trust you all have, but what is the Bible but a dead letter without Christ? Ah! I would you could all say what a poor woman once said. “I have Christ here,” as she put her hand on the Bible, “and I have Christ here,” as she put her hand on her heart, “and I have Christ there,” as she raised up her eyes towards heaven; but if you have not Christ in the heart, you will not find Christ in the Book, for He is discovered there in His sweetness, and His blessedness, and His excellence, only by those who know Him and love Him in their hearts. Do not get the idea that a certain quantity of Bible-reading, and particular times spent in repeating prayers, and regular attendance at a place of worship, and the systematic contribution of a guinea or so to the support of public worship and private charities will ensure the salvation of your souls. No, you must be born again. And that you cannot be; for it is not possible that you could have been born again if you are still living without Christ. To have Christ is the indispensable condition of entering heaven. If you have Him, though compassed about with a thousand infirmities, you shall yet see the brightness of the eternal glory; but if you have not Christ, alas! for all your toil, and the wearisome slavery of your religion, you can but weave a righteousness of your own, which shall disappoint your hope, and incur the displeasure of God.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3472.cfm