It presupposes and end the nobility of the end determines the goodness of it. For a man who is not good, the correct end may not be apparent because bad habit may corrupt him. A man cannot be prudent if he is not good. However, without prudence there is no virtue. When prudence exists in the complete sense, all the other virtues are present.
Some people are naturally virtuous and desire good ends.
The greatest natural virtue is wisdom. The virtue which one must develop in order to attain moral virtue and to find the correct mean in all of one's actions is prudence. Prudence is the ability to deliberate well regarding human actions. It seems, however, that by connecting prudence and ethical virtue so closely, Aristotle has created a closed circle which precludes one from becoming virtuous. Prudence concerns means, not ends.