In Passive Obedience Berkeley argues that we must always observe the prohibitions decreed by our sovereign rulers. He defends this thesis both by providing critiques against opposing views and, more interestingly, by presenting a moral theory that supports it. The theory contains elements of divine-command, natural-law, moral-sense, rule-based, and outcome-oriented ethics. Ultimately, however, it seems to rest on a notion of spiritual reason—a specific God-given faculty that all rational human beings have. Berkeley’s work on immaterialism, for which he is better known, could thus perhaps best be seen as an attempt to find a scientific justification for his moral doctrine.