PROTAGORAS
Of all things the measure is Man, of the things that are, that they are, and of the things that are not, that they are not.
About the gods, I am not able to know whether they exist or do not exist, nor what they are like in form; for the factors preventing knowledge are many: the obscurity of the subject, and the shortness of human life.
A contemporary of Socrates and later labelled a sophist by Plato, in 415 BCE Protagoras was forced to flee Athens because his works were condemned for impiety.
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history of science 101 