The goal of the final chapter is to examine the central role of necessities in the epistemological, moral and political theory of An Essay of Human Understanding and of the Two Treatises of Government. A study of the former shows Locke’s preoccupation with classical moral questions such as happiness and the ‘good objects of desires’ and how necessities helped him to strike a balance between tradition and the new science. As a rule of thumb of proper conduct, knowledge of necessities leads to the preservation of life, a human being’s most important duty to God. His doctrine of necessities is what made it possible for Locke to develop the theory of the public good with which, it is argued, he attempted to defeat the egoist theory of self-interest. Examination of his conception of property and money through the lens of human necessities shows a certain ambiguity in Locke’s normative ideals. Nevertheless, my conclusion is that above other considerations underlying the capital-oriented ideals of the period, the last word of Locke’s political theory is the public good represented by preservation and convenience for the commonwealth and, when possible, for the whole of humanity.