A relation is formed betwixt every man and the fruits of his own labour, the very thing we call property, which he himself is sensible of, and of which every other is equally sensible. Yours and mine are terms in all languages, familiar among savages, and understood even by children. This is a fact, which every human creature can testify.

Essays on the Principles of Morality and Natural Religion: In Two Parts (ed. 1758)