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"Protagoras" was a Pre-Socratic philosophy/pre-Socratic Ancient Greeks/Greek philosopher and is numbered as one of the sophists by Plato. In his dialogue, Protagoras (dialogue)/Protagoras, Plato credits him with having invented the role of the professional sophist.

He also is believed to have created a major controversy during ancient times through his statement that, "Man is the measure of all things", interpreted by Plato to mean that there is no absolute truth, but that which individuals deem to be the truth. Although there is reason to question the extent of the interpretation of his arguments that has followed, that concept of individual relativity was revolutionary for the time, and contrasted with other philosophical doctrines that claimed the universe was based on something objective, outside of human influence or perceptions.

If you enjoy these quotes, be sure to check out other famous philosophers! More Protagoras on Wikipedia.