Protagoras
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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.

There are two sides to every question.

Man is the measure of all things.

You, Socrates, began by saying that virtue can't be taught, and now you are insisting on the opposite, trying to show that all things are knowledge, justice, soundness of mind, even courage, from which it would follow that virtue most certainly can be taught.

The Athenians are right to accept advice from anyone, since it is incumbent on everyone to share in that sort of excellence, or else there can be no city at all.

No intelligent man believes that anybody ever willingly errs or willingly does base and evil deeds; they are well aware that all who do base and evil things to them unwillingly.

Let us hold our discussion together in our own persons, making trial of the truth and of ourselves.

The art of measurement, by showing us the truth would have brought our soul into the repose of abiding by the truth, and so would have saved our life.

When it comes to consideration of how to do well in running the city, which must proceed entirely through justice and soundness of mind.