Compulsory, then, it appears, is that of which the cause is external, the person compelled contributing nothing thereto.

What is done through ignorance is always “not-voluntary,” but is “involuntary” 41 when the agent is pained afterwards and sorry when he finds what he has done. 42 For when a man, who has done something through ignorance, is not vexed at what he has done, you cannot indeed say that he did it voluntarily, as he did not know what he was doing, but neither can you say that he did it involuntarily or unwillingly, since he is not sorry.

A man who has acted through ignorance, then, if he is sorry afterwards, is held to have done the deed involuntarily or unwillingly; if he is not sorry afterwards we may say (to mark the distinction) he did the deed “not-voluntarily;” for, as the case is different, it is better to have a distinct name.