John Locke, Adam Smith, and Thomas Hobbes were influential Enlightenment thinkers. Locke believed in natural rights and that people consent to governments through a social contract. Smith developed the idea of laissez-faire economics and that governments should not intervene in the economy. Hobbes argued that absolute monarchy was the best form of rule to keep humans in line given their natural selfishness and violence. Voltaire advocated for religious tolerance, justice, free speech, and ending slavery. Montesquieu's book influenced the American founders by proposing separation of a government's executive, legislative, and judicial powers. Diderot spread Enlightenment ideas through his Encyclopedia, which was translated globally.