Plato is one of the most influential philosophers of all time.

Plato is arguably the single most influential philosopher of all time with major contributions to contemporary and modern philosophy. So significant is the Plato contribution that the modern British philosopher, Albert North Whitehead, quipped that "the safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato." If Whitehead overstated his case, it was not by a wide margin. Plato's contribution extends to virtually every area of philosophy.

Plato's Social Philosophy

Although Plato's writings extend to every corner of academia, political philosophy was his most common subject. In "Republic," perhaps the most famous of his dialogues, he tackled the difficult questions of what constitutes justice and how a just state should function. Plato's answers were controversial and "Republic" has encouraged philosophical debate in every century after its writing. Later philosophers like Robert Nozick and John Rawls drew heavily on Plato's work in constructing their own conceptions of justice and the state.

Philosophy of Rhetoric

Plato also studied and wrote extensively on rhetoric or the art of persuasion. Two of Plato's most important dialogues, "Phaedrus" and "Gorgias," address questions about the nature of rhetoric. For Plato, rhetoric and argument were ways to deduce truths about the world through careful introspection. However, he also saw rhetoric as a potentially dangerous weapon in the hands of sophists and demagogues. Later philosophers like Aristotle, Cicero and Augustine expanded on Plato's philosophy of rhetoric.

The Platonic Epistemology

Yet another of Plato's essential contribution to philosophy is his work on epistemology. Epistemology is the study of knowledge, or how people come to know things. Plato was among the first philosophers to consider the idea of a priori knowledge, defined as knowledge that exists independent of experience. In "Republic" and other dialogues, Plato argued that human experience was always limited and deceptive. The real truth he said emerged not from the real world but from the world of ideas. Plato argued that idealized "forms" represented the true, perfect version of every thing or idea in the universe. This powerful concept has puzzled and inspired great philosophers like David Hume, Martin Heidegger and Jacques Derrida for generations and inspired these social philosophers and their contributions.

Plato's Dialectic Explored

Beyond his writings and findings, the Plato contribution to philosophy that involved a new method for answering philosophical questions was created. Nearly all of Plato's writings took the form of dialogues between Socrates and various other characters that were part of Plato's social philosophy. The characters disagree and argue with each other. Plato's use of dialogue pitted arguments and ideas against each other allowing the best ideas to rise to the surface. This dialectical method ensures rigorous scrutiny of every premise and conclusion. Although few modern philosophers write in dialogue, the dialectic has influenced subsequent methods of philosophical explication.