Good deliberation, however, is impossible without calculation.

We have no choice left, then, but to say that it is correctness of reasoning ( διάνοια ); for reasoning is not yet assertion: and whereas opinion is not an inquiry, but already a definite assertion, when we are deliberating, whether well or ill, we are inquiring and calculating.

But as good deliberation is a kind of correctness in deliberation, we must first inquire what deliberation means, and what its field is. 156