Plato, Theaetetus, section 182e

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[182e] seeing or hearing?

Theodorus
It must be impossible, if all things are in motion.

Socrates
Then we must not speak of seeing more than not seeing, or of any other perception more than of non-perception, if all things are in all kinds of motion.

Theodorus
No, we must not.

Socrates
And yet perception is knowledge, as Theaetetus and I said.

Theodorus
Yes, you did say that.

Socrates
Then when we were asked “what is knowledge?” we answered no more what knowledge is than what not-knowledge is.

Plato. Plato in Twelve Volumes, Vol. 12 translated by Harold N. Fowler. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1921.

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