Aristotle, and W. Rhys Roberts. Rhetoric. Mineola, NY: Dover, 2004. Kindle Electronic Edition.
Book I, chapter 11.
Aristotle here discusses pleasure as that which brings the whole soul “into its normal state of being” (Aristotle I.11, B. 1370a), with pain as the opposite. He also views habit as being pleasant. Yet activities requiring effort are unpleasant until we are accustomed to them (Aristotle I.11, B 1370b). Even negative events in the past may sometimes be remembered with pleasure (Aristotle I.11, B 1370b). Aristotle also mentions revenge and other victories as bringing pleasure (Aristotle I.11, B 1371a). He continues listing many situations which people find to bring pleasure.