Give me strength or give me a reason: Self-control, religion, and the currency of reputation.

We show that Kurzban and colleagues’ approach illuminates the relationship between religion and self-control. Whereas resource-depletion theorists suggest religion replenishes self-control resources (“strength”), we submit that religious cues make people feel observed, giving them “reason” to persevere, and we describe an experiment that supports our interpretation. Finally, we question the claim that subjective fatigue is a signal to redeploy resources.