This document discusses the third angel's message from Revelation 14:9-12. It explains that the third message is a warning about worshipping the beast and receiving its mark. It says Jesus gave the prophecies in Revelation and the three angel's messages. The document analyzes what constitutes the mark and image of the beast. It argues that the mark is Sunday worship, which originated with the Catholic Church and was accepted by Protestants. It warns that a future Sunday law will enforce this and lead to persecution before Christ's second coming.