Plato, Theaetetus, section 181d

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[181d] remains in the same place, but grows old, or becomes black instead of white, or hard instead of soft, or undergoes any other kind of alteration, is it not proper to say that this is another kind of motion?

Theodorus
I think so.

Socrates
Nay, it must be true. So I say that there are these two kinds of motion: “alteration,” and “motion in space.”

Theodorus
And you are right.

Socrates
Now that we have made this distinction, let us at once converse with those who say that all things are in motion, and let us ask them, “Do you mean that everything moves in both ways,

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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