The biblical method of focusing on the gospel itself, without props, and allowing God to save whom He wills, when He wills, demands the hearing of the Word. And it demands trust that God will call His elect to Himself according to His own timetable. When the Word is preached, there will be varying responses (Acts 17:32-34). Just be faithful to preach the Word…and leave the results to God. He will save His elect according to His own timing.