Protagoras’s complete works would be at the top of my personal list. Protagoras’s two most famous sayings were that “man is the measure of all things” and that the existence of gods is an unverifiable assumption. He developed a concept of civic “concord,” an early form of “social contract” theory. His ideas are relevant today. The problem is the difficulty of accessing them. They are discussed in the Protagoras and Theaetetus of Plato, who himself profoundly disagreed with the gifted Abderite—and took issue with the idea of democracy. Since Protagoras, who was born in about 490 BC, was much
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