Who was John Locke? Describe what he did that changed everything.

John Locke was among the most famous philosophers and political theorists of the 17th century. He is often regarded as the founder of a school of thought known as British Empiricism, and he made foundational contributions to modern theories of limited, liberal government. He was also influential in the areas of theology, religious toleration, and educational theory. In his most important work, the Essay Concerning Human Understanding, Locke set out to offer an analysis of the human mind and its acquisition of knowledge. He offered an empiricist theory according to which we acquire ideas through our experience of the world. The mind is then able to examine, compare, and combine these ideas in numerous different ways. Knowledge consists of a special kind of relationship between different ideas. Locke's emphasis on the philosophical examination of the human mind as a preliminary to the philosophical investigation of the world and its contents represented a new approach to philosophy, one which quickly gained a number of converts, especially in Great Britain. In addition to this broader project, the Essay contains a series of more focused discussions on important, and widely divergent, philosophical themes. In politics, Locke is best known as a proponent of limited government. He uses a theory of natural rights to argue that governments have obligations to their citizens, have only limited powers over their citizens, and can ultimately be overthrown by citizens under certain circumstances. He also provided powerful arguments in favor of religious toleration. This article attempts to give a broad overview of all key areas of Locke's thought.