Perhaps the most succinct summary of the geolibertarian philosophy is Thomas Paine's assertion in his 1797 pamphlet "Agrarian Justice": "Men did not make the earth. It is the value of the improvements only, and not the earth itself, that is individual property. Every proprietor owes to the community a ground rent for the land which he holds". On the other hand, John Locke wrote that private land ownership should be praised as long as its product was not left to spoil and there was "enough, and as good left in common for others". When this Lockean proviso is violated, the land earns rental value. Some geolibertarians argue that "enough, and as good left" is a practical impossibility in a city setting because location is paramount. This implies that in any urban social environment Locke's proviso requires the collection and equal distribution of ground rent. Geolibertarians often dispute the received interpretation of Locke's homestead principle outlined in his "Second Treatise of Government" as concerning the justice of initial acquisition of property in land, opting instead for a view ostensibly more compatible with the proviso which considers Locke to be describing the process by which property is created from land through the application of labor.