The late Herbert W. Armstrong claimed to restore 18 truths to the Philadelphia era of the Church of God that the previous era, (Smyrna) had lost. He also claimed that the Ephesus era of the Church of God knew these truths. In this sermon, Dr. Thiel quotes Herbert Armstrong, the Bible, and early church writings to demonstrate that early professors of Christ were familiar with these truths. In this first part of a two-part sermon, Dr. Thiel goes through the first 8 truths Herbert Armstrong once listed that God used him to restore: 1. True Gospel, 2. Purpose of God, 3. God’s Plan through the Holy Days, 4. Proper Hierarchical Church, Government, 5. Who and What is God?, 6. What and Why is Man?, 7. Spirit in Man, and 8. Firstfruits In this Age. Dr. Thiel also mentions that the list of 18 truths that the Tkach Administration put out were NOT the same as those that Herbert Armstrong listed. Dr. Thiel also listed all 18 of the 'restored truths' at the end of the sermon.
A written article of related interest is titled "18 Truths Restored to the Churches of God" URL: http://www.cogwriter.com/18.htm