book III
Again the case of the arts and that of the virtues are not similar; for the products of the arts have their goodness in themselves, so that it is enough that they should have a certain character, but if the acts that are in accordance with the virtues have themselves a certain character it does not follow that they are done justly or temperately.the agent also must be in a certain condition when he does them; in the First place he must have knowledge, secondly he must choose the acts and choose them for their own sakes, and thirdly his action must proceed from a firm and unchangeable character.[p.374]

“Virtue, then, is a state of character concerned with choice, lying
in a mean, i.e. the mean relative to us, this being determined by a
rational principle, and by that principle by which the man of practical
wisdom would determine it.” (1106b 36-8)
wish relates rather to the end, choice to the means; for instance, we wish to be health but we choose the acts which will make us healthy.

that man is a moving principle of actions; now deliberation is about the thing to be done by the agent himself, and actions are for the sake of things other than themselves. for the end can not be a subject of deliberation, but only the means nor indeed can the particular facts be a subject of it.

the object of choice being one of the things in our own power which is desired after deliberation, choice will be deliberate desire of things in our own power, for when we have decided as a result of deliberation, we desire in accordance with our deliberation.

for each state of character has its own ideas of the noble and the pleasant, and perhaps the good man differs from others most by seeing the truth in each class of things, being as it were the norm and measure of them. in most things the error seems to be due to pleasure; for it appears a good when it is not. we therefore choose the pleasant as a good, and avoid pain as an evil.

the end, then being what we wish for, the means what we deliberate about and choose, actions concerning means must be according to choice and voluntary. now the exercise of the virtues is concerned with means.{p.395}