The eighteenth century is often thought of as an important era for the secularization of British philosophy. One dimension of this secularization involves philosophers developing theories that, while not explicitly rejecting God, are less reliant on claims about God for their intelligibility and plausibility. A comparison of Adam Smith with his teacher, Francis Hutcheson, reveals an underappreciated facet of this process. Hutcheson portrayed God as an impartial legislator and used this metaphor to clarify contested moral rules in a way that would make little sense if God did not exist. In contrast, Smith's impartial spectator does not require belief in a God who is the author of the moral law in order to determine the correct interpretation of contested moral principles. By pursuing this alternative conception of impartiality, Smith developed a theory that was, in this respect, less reliant on religious premises than Hutcheson's had been.