Aquinas’s Proto-Lockean Labor Theory of Property

In ST II-II, Q. 66, article 5, "Whether theft is always a sin?", reply to objection 2, Aquinas touches on the question of previously unappropriated goods in a way that anticipates John Locke's later "homesteading" or "labor" theory of property or ownership (from his Second Treatise on Government). First, the objection, then Aquinas's reply: Obj. …