Man is the measure of all things

Cultural  

1. A statement by the ancient Greek philosopher Protagoras. It is usually interpreted to mean that the individual human being, rather than a god or an unchanging moral law, is the ultimate source of value.

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Man is the measure of all things

A nonsentimental environmentalism is one founded on Protagoras' maxim that "Man is the measure of all things."

From Time Magazine Archive

"Man is the measure of all things," declared an ancient philosopher.

From The Enjoyment of Art by Carleton Eldredge Noyes

He makes the discovery that Protagoras made two thousand years ago: "Man is the measure of all things"; standards of good and evil depend on the accidents of time, space, and circumstance.

From Human Traits and their Social Significance by Irwin Edman

Thus the flux of Homer and Heracleitus, the great Protagorean saying that "Man is the measure of all things," the doctrine of Theaetetus that "Knowledge is perception," have all the same meaning.

From Theaetetus by Benjamin Jowett

Protagoras was the author of the famous saying, "Man is the measure of all things; of what is, that it is; of what is not, that it is not."

From A Critical History of Greek Philosophy by W. T. (Walter Terence) Stace

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