What is "the wheel"?

"The wheel" was a common image in medieval theology and helps us to understand the ideas at work in [Murder in the Cathedral]. Associated primarily with the medieval thinker Boethius, the wheel image posits that God sits at the center of a large wheel, and hence understands the system behind its rotations. Humans, who live at various places along the edge of the wheel, are confounded by those rotations and cannot glimpse the order behind them. Thus, serenity comes in accepting that we can never understand the workings of the universe and should instead endeavor to transcend our humanity so as to deserve God's protection after death.

Thomas enters the play prepared to seek martyrdom for earthly reasons, but learns that he must simply submit himself to God's control. In effect, he has to rid himself of his earthly ambitions because they are necessarily flawed. Those ambitions cannot possibly take the universe into account. One of the lessons Thomas learns – and which he teaches the Chorus through his example – is that our lives of suffering and difficulty are illusions that we overvalue. We can never understand them, and so we should not dwell on them. Instead, we should focus on pleasing God, in faith that he knows why and how the wheel turns, and will reward us for our faith in a way we could never reward ourselves because of our limited perspectives.