Nicomachean Ethics

Now since all involuntary action is either upon compulsion or by reason of ignorance, Voluntary Action would seem to be “that whose origination is in the agent, he being aware of the particular details in which the action consists.”

For, it may be, men are not justified by calling those actions involuntary, which are done by reason of Anger or Lust.

Because, in the first place, if this be so no other animal but man, and not even children, can be said to act voluntarily. Next, is it meant that we never act voluntarily when we act from Lust or Anger, or that we act voluntarily in doing what is right and involuntarily in doing what is discreditable? The latter supposition is absurd, since the cause is one and the same. Then as to the former, it is a strange thing to maintain actions to be involuntary which we are bound to grasp at: now there are occasions on which anger is a duty,[5] and there are things which we are bound to lust after,[6] health, for instance, and learning.

Again, whereas actions strictly involuntary are thought to be attended with pain, those which are done to gratify lust are thought to be pleasant.

Again: how does the involuntariness make any difference[7] between wrong actions done from deliberate calculation, and those done by reason of anger? for both ought to be avoided, and the irrational feelings are thought to be just as natural to man as reason, and so of course must be such actions of the individual as are done from Anger and Lust. It is absurd then to class these actions among the involuntary.