ANSWER: Before any can be convinced of this or any other truth they must first be caused to realize that in religious matters all authority resides solely in the Bible. Many verses can be used to teach and support this basic truth, e.g., Matthew 7:21-29; Mark 16:15-16; John 12:48; John 17:17; Romans 1:16; Galatians 1:6-9; 2 Timothy 2:15; 2 Timothy 3:15-17; Revelation 22:18-19; etc. Once this truth is accepted, the honest heart will be receptive to the truth of the one church as taught in Matthew 16:18; John 17:20-23; Acts 2:37-47; Ephesians1:22-23; Ephesians 4:4-6; etc.