Every vicious man, indeed, is ignorant of 43 what ought to be done and what ought not to be done, and it is this kind of error that makes men unjust and bad generally. But the term “involuntary” is not properly applied to cases in which a man is ignorant of what is fitting. 44 The ignorance that makes an act involuntary is not this ignorance of the principles which should determine preference (this constitutes vice)—not, I say, this ignorance of the universal (for we blame a man for this), but ignorance of the particulars, of the persons and things affected by the act. These are the grounds of pity and pardon; for he who is ignorant of any of these particulars acts involuntarily.
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