Aristotle’s account of virtue and happiness

I need a short response to this

“This week, we are reading Aristotle’s account of virtue and happiness. In your own words, explain what he means when he says: “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.” You may choose to give an example of a situation in which one must use their practical wisdom to determine the virtuous way to act.”

I just need a short paragraph and please don’t use any big/ crazy vocabulary. thanks