Gorgias (ca. 485–380 B.C.) was a Sophist whose position was even more extreme than Protagoras’s. Protagoras concluded that, because each person’s experience furnishes him or her with what seems to be true, “all things are equally true.” Gorgias, how- ever, regarded the fact that knowledge is subjective
Complete he sees, complete he thinks, complete he hears.
He remains forever in the same place, entirely motionless,
Nor is it proper for him to move from one place to another.
But effortlessly he shakes all things by thinking with his own mind.
Interestingly, Xenophanes was skeptical even of his own teachings, remarking:
“Let these things be believed as approximations to the truth.”