Since the book of Revelation was written, millions of sincere Christians have shown great interest in knowing the true interpretation of the passage registered in verses 16 to 18 of the 13th chapter of Revelation. It is said in that passage that a mark will be placed on the right hand or forehead of the inhabitants of the world. Due to erroneous interpretations, there are millions of people today that are very worried because they would not be able, according to the Scripture, to buy or sell unless they submit themselves to the authority inspired and directed by Satan.