Full Idea
To feel pleasure or pain rightly or wrongly affects our conduct, so our whole enquiry must be concerned with them.
Gist of Idea
Feeling inappropriate pleasure or pain affects conduct, and is central to morality
Source
Aristotle (Nicomachean Ethics [c.334 BCE], 1105a07)
Book Reference
Aristotle: 'Ethics (Nicomachean)', ed/tr. ThomsonJ A K/TredennickH [Penguin 1976], p.96
A Reaction
Apparently the Nazi staff at Auschwitz said that they all felt largely 'indifferent' to what they were doing. Aristotle hopes you can teach these right feelings, but children can develop very unpredictably.