 The first interpretation of Locke’s moral theory is what we might call an incompatibility thesis: Locke scholars Laslett, Aaron, von Leyden, among others, hold that Locke’s natural law theory is nothing more than a relic from Locke’s early years, when he wrote the Essays on the Law of Nature, and represents a rogue element in the mature empiricist framework of the Essay. For these commentators, the two elements found in the Essay seem not only incommensurable, but the hedonism seems the obvious and straightforward fit with Locke’s generally empiricist epistemology. The general view is that Locke’s rationalism seems, for all intents and purposes, to have no significant role to play, either in the acquisition of moral knowledge or in the recognition of the obligatory force of moral rules. These fundamental aspects of morality seem to be taken care of by Locke’s hedonism. Worse than this, however, is that the two views rely on radically different epistemological principles. The conclusion tends to be that Locke is holding on to moral rationalism in the face of serious incoherence. The incompatibility thesis is supported by the fact that Locke seems to emphasize the role of pleasure and pain in moral decision-making, however it has difficulty making sense of the presence of Locke’s moral rationalism in the Essay and other of Locke’s later works (not to mention the exalted role he gives to rationally-deduced moral law). Added to this, even in Locke’s early work, he seems to hold both positions simultaneously. Aaron and von Leyden both throw up their hands. According to von Leyden, in the introduction to his 1954 edition of Locke’s Essays on the Law of Nature,