Or, put another way, in feeling certain emotions are we doing evil. When Aquinas and Aristotle refer to an ordered soul and actions being controlled by reason, it sometimes seems that our emotions themselves are evil. We are expected to do what we KNOW is right. But, emotions themselves are neither good nor evil. If instead of controlling my emotion of anger, I dwell in it and ram my car into the other driver's, then I have committed an evil.
Actions are still voluntary, and can be judged morally.