The cross is the true center of history—everything leads up to it and everything flows from it. The death of God upon a tree is not just some event within history, it is the event that defines and explains, reveals and redeems all of history. However we understand the origin of sin within the human story, its trajectory moves inevitably toward Good Friday. This is the moment when the Spirit of Love that flows between the Father and Son erupted to engulf and forgive the sin of the world.