Through a Lockean Lens: Analyzing the Influence of Locke and Montesquieu on Thomas Jefferson

The influence of John Locke’s political philosophy on Thomas Jefferson is well-documented, from their shared belief in natural rights to their similar theories of property to their shared support of religious freedom. As one of Jefferson’s “three greatest men,” Locke’s influence cannot be understated. The influence of Baron de Montesquieu is far more contested, but nonetheless Jefferson’s close study of Montesquieu and their shared belief in the character of republics and the necessity of education, among other things, provide clear evidence for Montesquieu’s influence. I propose that the dissonance between Montesquieu’s ideas and Jefferson’s adaptation and application of them result from Jefferson’s Lockean lens: a framework based on Locke’s ideas that so profoundly impacted Jefferson’s beliefs that he molded other philosopher’s ideas to conform to Locke. By analyzing the political writings of Locke, Montesquieu, and Jefferson, as well as some of Jefferson’s personal writing (in the form of letters and his Literary Commonplace Book) the influence of both philosophers and the framework Locke provides can be established. Understanding this framework helps us better understand the philosophical foundations of Thomas Jefferson’s politics, and by extension understand the philosophical foundations of American political thought.