The Republic by Plato Part 9 Page 58

Certainly.

And if you raise the power and make the plane a solid, there is no difficulty in seeing how vast is the interval by which the tyrant is parted from the king.

Yes; the arithmetician will easily do the sum.

Or if some person begins at the other end and measures the interval by which the king is parted from the tyrant in truth of pleasure, he will find him, when the multiplication is completed, living 729 times more pleasantly, and the tyrant more painfully by this same interval.

What a wonderful calculation! And how enormous is the distance which separates the just from the unjust in regard to pleasure and pain!

Yet a true calculation, I said, and a number which nearly concerns human life, if human beings are concerned with days and nights and months and years.