Rawls derives two principles of justice from the original position. The first of these is the Liberty Principle, which establishes equal basic liberties for all citizens. 'Basic' liberty entails the (familiar in the liberal tradition) freedoms of conscience, association and expression as well as democratic rights; Rawls also includes a personal property right, but this is defended in terms of moral capacities and self-respect,  rather than an appeal to a natural right of self-ownership (this distinguishes Rawls's account from the classical liberalism of John Locke and the libertarianism of Robert Nozick).
Book II of the Essay sets out Locke's theory of ideas, including his distinction between passively acquired simple ideas, such as "red," "sweet," "round," etc., and actively built complex ideas , such as numbers, causes and effects, abstract ideas, ideas of substances, identity, and diversity. Locke also distinguishes between the truly existing primary qualities of bodies, like shape, motion and the arrangement of minute particles, and the “secondary qualities” that are "powers to produce various sensations in us" ( Essay, II. ) such as "red" and "sweet." These “secondary qualities,” Locke claims, are dependent on the “primary qualities.” This part of Locke’s thought would be sharply and famously criticized by Berkeley, who argued that there was no basis for a distinction between primary and secondary qualities and for asserting that primary qualities were any more “real” than the secondary ones. The weak point in Locke’s thought is that, in his own words, the substrate of those primary qualities, substance , is a “I know not what.” In other words, Locke is convinced that there must be something (substance) that is the foundation of objective existence and carries the primary qualities, but he is unable to further define it based on his empirical method.