Aristotle’s description of the temperate person for a standard for what is constructive emotional behaviour:
Our emotions must be in the right amount, proportional to the event that called them forth; they must be expressed at the right time, in a way that is appropriate to the emotional trigger and the circumstances in which it occured; and they must be expressed in the right way, in a way that does no harm. (P. 53)
Ekman, Paul. Emotions Revealed: Recognizing Faces and Feelings to Improve Communication and Emotional Life. new york: Owl Books, 2004.