Prohairesis

Prohairesis variously translated as "moral character", "will", "volition", "choice", "intention", or "moral choice") is a fundamental concept in the Stoic philosophy of Epictetus. It represents the choice involved in giving or withholding assent to impressions (phantasiai). 

Explanation by Epictetus

According to Epictetus, nothing is properly considered either good, or bad, aside from those things that are within our own power to control, and the only thing fully in our power to control is our own volition (prohairesis) which exercises the faculty of choice that we use to judge our impressions. For example, if a person says something critical to us, that is not bad; or, if something complimentary is said, that is not good, because such things are externals and not in our power to control. By exerting the power of choice, it is possible to maintain equanimity in the face of either criticism and praise, which is a moral good. On the other hand, when people become troubled by criticism, or elated by praise, that is a moral evil because they have misjudged impressions by thinking that things not in their power (such as criticism or praise) have value, and by doing that they place a measure of control of their own life in the hands of others.

The importance of prohairesis for Epictetus is that it exerts a power that allows people to choose how they will react to impressions rationally:

Remember that what is insulting is not the person who abuses or hits you, but the judgment that these things are insulting. So when someone irritates you, realize that it is your own opinion that has irritated you. Try, therefore, in the first place, not to be carried away by the impression; for if you once gain time and respite, you will find it easier to control yourself.


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