How deep is God's forgiveness? Drawing upon a real historical situation from the third century A.D. and on the story of Peter's threefold denial, Zack attempts an answer.

Why did Judas betray Jesus? The question is surprisingly difficult to answer -- but some informed speculation can help illuminate some very important dynamics for Christian faith.

In this Epiphany sermon, Zack contrast two ways of Christ "illuminating" the world -- and argues that God often works in mustard-seed ways.

Why does the Christmas story include this horrible story of infants being slaughtered? Zack attempts to answer that question and, in doing so, explores the implications of our need for systematizing our faith.

In this short sermon, Zack tells the story of Damien of Molokai as an analogy for understanding the mystery of the incarnation.

What is our ultimate Christian hope? This Advent, as in Advents past, Zack sketches some of the answers to this question. This week, he focuses on what our hope for Sabbath Rest means.

What is our ultimate Christian hope? This Advent, as in Advents past, Zack sketches some of the answers to this question. This week, he focuses on how God intends to go beyond even restoring to fullness all that He had created.

What, exactly, is "the Gospel"? Zack argues that it depends on who you are talking to. And this story -- of the woman who gives everything to anoint Jesus -- is a great way to understand the Gospel for many today.

Zack confesses that he has no idea what to do with Jesus' statement in Mark 13:30. This confession launches reflection on trust, knowing, and living out a fully human faith.

What, exactly, should we do with Jesus' end-times prophecy in Mark 13? Zack suggests that the text pressures us in three important ways.