The defence of one’s self, justly called the primary law of nature, is not, nor can it be abrogated by any regulation of municipal law. This principle of defence is not confined merely to the person; it extends to the liberty and the property of a man: it is not confined merely to his own person; it extends to the persons of all those, to whom he bears a peculiar relation -- of his wife, of his parent, of his child, of his master, of his servant: nay, it extends to the person of every one, who is in danger; perhaps, to the liberty of every one, whose liberty is unjustly and forcibly attacked. It becomes humanity as well as justice.

- James Wilson - 'Of the Natural Rights of Individuals' - 1790-1792
(Via walls of the city)