 Although some of his sermons contain interesting analyses of individual Christian virtues, the most sustained exposition of Clarke’s deontological, rationalist ethics is contained in his second set of Boyle Lectures, A Discourse Concerning the Unalterable Obligations of Natural Religion. Clarke begins by stating that clearly there are different relations among persons and that from these relations there arise a “fitness” or “unfitness” of behavior among persons. So, for example, given the relation of infinite disproportion between humans and God, it is fit that we honor, worship, and imitate God. These facts can be rationally apprehended by anyone with a sound mind, although in some cases we may be at a loss in clearly demarcating right from wrong. Being grounded in necessary relations, ethical truths, like geometrical truths, are universal and necessary. As such, they are independent of any will, divine or human, and of any consideration of punishment or reward.