Book 6: The Intellectual Virtues.
Inquiry and deliberation are not the same; for deliberation is a particular kind of inquiry. But we must ascertain what good deliberation is—whether it is a kind of science or opinion, or happy guessing, or something quite different.
It is not science; for we do not inquire about that which we know: but good deliberation is a kind of deliberation, and when we deliberate we inquire and calculate.
Nor is it happy guessing; for we make happy guesses without calculating and in a moment, but we take time to deliberate, and it is a common saying that execution should be swift, but deliberation slow.
Good deliberation, again, is different from sagacity, which is a kind of happy guessing.
Nor is it any kind of opinion.
But since in deliberating ill we go wrong, and in deliberating well we go right, it is plain that good deliberation is a kind of rightness, but a rightness or correctness neither of science nor opinion; for science does not admit of correctness (since it does not admit of error), and correctness of opinion is simply truth; and, further, that concerning which we have an opinion is always something already settled.
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.
Now, there are various kinds of correctness, and it is plain that not every kind of correctness in deliberation is good deliberation; for the incontinent man or the vicious man may duly arrive, by a process of calculation, at the end which he has in view, so that he will have deliberated correctly, though what he gains is a great evil. But to have deliberated well is thought to be a good thing; for it is only a particular kind of correctness in deliberation that is called good deliberation—that, namely, which arrives at what is good.
But, further, what is good may be arrived at by a false syllogism; I mean that a right conclusion as to what is to be done may be arrived at in a wrong way or upon wrong grounds—the middle term being wrong; so that what leads to a right conclusion as to what should be done is not good deliberation, unless the grounds also be right.
A further difference is that one may arrive at the right conclusion slowly, another rapidly. So we must add yet another condition to the above, and say that good deliberation means coming to a right conclusion as to what is expedient or ought to be done, and coming to it in the right manner and at the right time.
Again, we speak of deliberating well simply, and of deliberating well with a view to a particular kind of end. So good deliberation simply [or without any qualifying epithet] is that which leads to right conclusions as to the means to the end simply; a particular kind of good deliberation is that which leads to right conclusions as to the means to a particular kind of end. And so, when we say that prudent men must deliberate well, good deliberation in this case will be correctness in judging what is expedient to that end of which prudence has a true conception.