Man is the measure of all things

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.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.