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 two definitions of liberty. (1) It is the power to do what does not injure others. (2) It is a right limited by the consideration that others must enjoy the same rights. It is important to bear in mind that these two definitions are highly discrepant. If my right to knock a man down is only limited by his equal right to knock me down, the law has no business to interfere when we take to our fists. If, on the other hand, I have no right to injure another, the law should interfere. Very little reflection suffices to show that this is the sounder principle, and that respect for the equal liberty of another is not an adequate definition of liberty. My right to keep my neighbour awake by playing the piano all night is not satisfactorily counterbalanced by his right to keep a dog which howls all the time the piano is being played. The right of a “sweater” to pay starvation wages is not satisfactorily limited by the corresponding right which his employee would enjoy if he were in a position to impose the same terms on some one else. Generally, the right to injure or take advantage of another is not sufficiently limited by the right of that other if he should have the power to retaliate in kind. There is