Sir John W. Salmond, Jurisprudence (1913)
“ Liability or responsibility is the bond of necessity that exists between the wrongdoer and the remedy of the wrong. This vinculum juris is not one of mere duty or obligation; it pertains not to the sphere of ought but to that of must. It has its source in the supreme will of the state, vindicating its supremacy by way of physical force in the last resort against the unconforming will of the individual. A man’s liability consists in those things which he must do or suffer, because he has already failed in doing what he ought. It is the ultimatum of the law. ”
