When discussing true virtue, Aristotle brings up the notion of the mean between excess and deficiency. Therefore, if the virtue is bravery, the excess would be rashness or foolhardiness, while the deficiency would be cowardice.
Now, Aristotle admits that ethics is not a precise science, and that the mean of an action will depend on the person, the situation, and a host of other factors. Because this notion of the mean seems so imprecise, do you think we can ever really know if we have attained it in a given situation? Does this imprecision pose a problem for anyone wanting to achieve Aristotle's notion of living a virtuous and happy life?