Two Treatises of Government

Sec. 40. Nor is it so strange, as perhaps before consideration it may appear, that the property of labour should be able to over-balance the community of land: for it is labour indeed that puts the difference of value on every thing; and let any one consider what the difference is between an acre of land planted with tobacco or sugar, sown with wheat or barley, and an acre of the same land lying in common, without any husbandry upon it, and he will find, that the improvement of labour makes the far greater part of the value.