Aristotle, and W. Rhys Roberts. Rhetoric. Mineola, NY: Dover, 2004. Kindle Electronic Edition.
Book II, chapter 3.
Because Aristotle has discussed anger and its causes he now moves to its opposite, calm. Calm feelings are provoked by those who do not slight us or who do it involuntarily (Aristotle II.3, B 1380a). In general if someone acts humbly toward us we respond with calm. A consideration of what inspires anger, then its opposite, helps grasp what inspires calm (Aristotle II.3, B 1380b).