“Threshold” is a four-week, Advent sermon series based on Isaiah. Called the “fifth” gospel by some prominent early Christians, the book of Isaiah is a perennial favorite during the season of Advent. It’s poetic prophesies help us to understand and anticipate the Christ who comes to us. The inspiration for this series comes from a trip to Chaco Canyon that I took some years ago. This remote world heritage site in northwestern New Mexico is home to ruins of an ancient civilization that thrived over seven hundred years before European settlement on the continent.