https://www.mljtrust.org/sermons-online/acts-7-42-50/in-spirit-and-in-truth/

People are instinctively inclined to worship. But who or what do they worship? In the sermon “In Spirit or in Truth,” Dr. Martyn Lloyd-Jones opens Acts 7:42–50 and shows how the human heart will either worship the one true God or worship an idol. False worship is marked by an emphasis on the external and it breeds a hypocrisy that tells people what to do and what not to do. It ignores the heart and focuses only on appearance before the world. It emphasizes the places of worship as a means to know God. They say one has to worship at this church or on this mountain. However, as Dr. Lloyd-Jones explains, there is no substance in any of it. It is shallow and lacks any power to effect real change. True religion, on the other hand, is a product of God’s saving work in the life of the sinful. This is a fundamental reorientation of the heart and mind that creates the desire to seek and love God. It produces true worship that is Spirit-filled and driven. True worship only comes from being a new creation in Christ. This is why the worship that God receives can only come from those who have been regenerated by believing in the gospel of grace that God has given in Christ Jesus.