Emotion as a Telo

As I was reading this week's chapter, I came across a hypothetical question about Aristotle's view on a human being's telo: If according to Aristotle our sole purpose as human beings were to reason, would an individual not be reaching their full potential of happiness if they lived a life of emotion? Even if that was their 'telo?'

If one were to lead a life solely based on their emotions, based on love, sadness, excitement, would they be living the right way, according to Aristotle? My attempt to answer this would center around another question, Would a person who believes that emotion is a tool for reason actually be living a knowledgeable and good life?  These type of questions are hard to answer. Yes, how to reason is up to the individual or no there is only one way to reason?