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Man is the measure of all things.

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More quotes by Protagoras

Man is the measure of all things: of things which are, that they are, and of things which are not, that they are not.

There are two sides to every question.

Concerning the gods, I have no means of knowing whether they exist or not or of what sort they may be, because of the obscurity of the subject, and the brevity of human life.

As to the gods, I have no means of knowing either that they exist or that they do not exist. For many are the obstacles that impede knowledge, both the obscurity of the question and the shortness of human life.

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.

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Quote text and notes from Wikiquote: Protagoras (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.