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[155a] consider again the nature of these appearances within us? And as we consider them, I shall say, I think, first, that nothing can ever become more or less in size or number, so long as it remains equal to itself. Is it not so?

Theaetetus
Yes.

Socrates
And secondly, that anything to which nothing is added and from which nothing is subtracted, is neither increased nor diminished, but is always equal.

Theaetetus
Certainly.


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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