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Yes, he said, the art of measurement.

Suppose, again, the salvation of human life to depend on the choice of odd and even, and on the knowledge of when a man ought to choose the greater or less, either in reference to themselves or to each other, and whether near or at a distance; what would be the saving principle of our lives? Would not knowledge?—a knowledge of measuring, when the question is one of excess and defect, and a knowledge of number, when the question is of odd and even? The world will assent, will they not?

Protagoras himself thought that they would.

Well then, my friends, I say to them; seeing that the salvation of human life has been found to consist in the right choice of pleasures and pains, —in the choice of the more and the fewer, and the greater and the less, and the nearer and remoter, must not this measuring be a consideration of their excess and defect and equality in relation to each other?

This is undeniably true.

And this, as possessing measure, must undeniably also be an art and science?