Quotation by Protagoras

Man is the measure of all things, of things that are that they are, and of things that are not that they are not.
Protagoras (c. 481–411 B.C.), Greek sophist. Fragment cited by Plato, p. 60, Philosophers Speak for Themselves, T.V. Smith, University of Chicago Press, Chicago (1934).

Classical statement of relativism.
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