Full Idea
Every bad man is ignorant of what he ought to do and refrain from doing.
Gist of Idea
Bad people are just ignorant of what they ought to do
Source
Aristotle (Nicomachean Ethics [c.334 BCE], 1110b29)
Book Reference
Aristotle: 'Ethics (Nicomachean)', ed/tr. ThomsonJ A K/TredennickH [Penguin 1976], p.113
A Reaction
This sounds more like the view on akrasia of Socrates than that of Aristotle. Aristotle thinks bad people can also know what is good, but be pulled away from it by strong desires.