https://www.mljtrust.org/sermons-online/acts-8-29-30/do-you-understand/

Why can't the world figure out its own need for salvation? In the sermon “Do You Understand?” Dr. Martyn Lloyd-Jones shows from Acts 8:29­–30 how the natural human is blinded to the truth of God. That is, they are unable to understand the spiritual things because they are fleshly and carnal. This is why those in the church who want to change the Christian message to be more accommodating to modern people are so mistaken. Modern humanity’s problem with the Christian message is really nothing unique. It is the product of an unbelieving and sinful nature. They do not need a more up-to-date message; their problem is much deeper. It is one of spiritual blindness and deadness. This is why only those who the Holy Spirit of God enlightens can see and believe in the gospel of Jesus Christ. Only God can give sinful people a new heart and mind that seeks after what is good and holy, and only He can work the miracle of regeneration so that those who were once dead can come to life in Christ. This is the Christian message that is so necessary in this time and in all times. This is the only message that the church has been given to proclaim to this broken and sin-filled world.