D.L. Moody emphasizes the grave sin of consulting mediums and seeking guidance from the dead, which he believes dishonors the Holy Spirit sent to guide believers into all truth. He warns that many Christians today are turning away from the Word of God, just as King Saul did when he consulted a familiar spirit, leading to his downfall. Moody stresses that the Holy Spirit and Scripture provide all the guidance one needs, and turning to other sources is a serious transgression against God. He cites the story of the rich man in Luke to illustrate that the teachings of Moses and the prophets are sufficient for salvation and understanding. Ultimately, he calls for believers to rely solely on the Holy Spirit and the Bible rather than seeking false lights.