Nelson Walters discusses the mysterious number 666 from Revelation 13:18. The scripture says understanding this number requires wisdom. What the Apostle John would have explained to his disciples and students is likely the most authoritative interpretation of how modern Christians should view this mysterious number.

The disciples of John told the early Church Father Irenaeus about his views of this number, and Irenaeus wrote these instructions in his book, “About Heresies” – written 80 years after Revelation. In this study, Nelson explores what Irenaeus says about the controversy between the numbers 616 and 666, how to calculate the number and, most importantly, when to do the calculation.