Kitap 5
4
(2) Moreover, it is not possible to act unjustly towards oneself in the sense in which a man is unjust who is a doer of injustice only and not universally wicked. (This case is distinct from the former, because Injustice in one sense is a special form of wickedness, like Cowardice, and does not imply universal wickedness; hence it is necessary further to show that a man cannot commit injustice against himself in this sense either.) For (a) if it were, it would be possible for the same thing to have been taken away from and added to the same thing at the same time. But this is impossible: justice and injustice always necessarily imply more than one person.
5
Again (b) an act of injustice must be voluntary and done from choice, and also unprovoked; we do not think that a man acts unjustly if having suffered he retaliates, and gives what he got. But when a man injures himself, he both does and suffers the same thing at the same time. Again (c) if a man could act unjustly towards himself, it would be possible to suffer injustice voluntarily.
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Furthermore (d) no one is guilty of injustice without committing some particular unjust act; but a man cannot commit adultery with his own wife, or burglary on his own premises, or theft of his own property.
6
(3) And generally, the question, Can a man act unjustly towards himself? is solved by our decision upon the question, Can a man suffer injustice voluntarily?
