Legal duty

Definition and stakes

Sir John W. Salmond Jurisprudence (1913)

A synonym of duty is obligation, in its widest sense, although in a special and technical application the latter term denotes one particular kind of duty only, as we shall see later.
Duties, like wrongs, are of two kinds, being either moral or legal. A moral or natural duty is an act the opposite of which would be a moral or natural wrong. A legal duty is an act the opposite of which would be a legal wrong. It is an act recognised as a duty by the law, and treated as such in and for the purposes of the administration of justice by the state.
Source: Gutenberg

Various Harvard Law Review (1897)

But if we take the view of our friend the bad man we shall find that he does not care two straws for the axioms or deductions, but that he does want to know what the Massachusetts or English courts are likely to do in fact. I am much of his mind. The prophecies of what the courts will do in fact, and nothing more pretentious, are what I mean by the law.
Take again a notion which as popularly understood is the widest conception which the law contains;—the notion of legal duty, to which already I have referred. We fill the word with all the content which we draw from morals.
Source: Wikisource

Sir John W. Salmond Jurisprudence (1913)

When the law recognises an act as a duty, it commonly enforces the performance of it, or punishes the disregard of it. But this sanction of legal force is in exceptional cases absent. A duty is legal because it is legally recognised, not necessarily because it is legally enforced or sanctioned. There are legal duties of imperfect obligation, as they are 181called, which will be considered by us at a later stage of our inquiry.
§ 72. Rights. A right is an interest recognised and protected by a rule of right. It is any interest, respect for which is a duty, and the disregard of which is a wrong.
Source: Gutenberg

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