Plato, Theaetetus, section 198b

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[198b] the sciences of numbers under his own control and also that any man who transmits them to another does this.

Theaetetus
Yes.

Socrates
And we say that when anyone transmits them he teaches, and when anyone receives them he learns, and when anyone, by having acquired them, has them in that aviary of ours, he knows them.

Theaetetus
Certainly.

Socrates
Now pay attention to what follows from this. Does not the perfect arithmetician understand all numbers; for he has the sciences of all numbers in his mind?

Theaetetus
To be sure.

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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