‘The first point of justice is that none should do any mischief to another unless he has first been attacked by the other’s wrongdoing. The second is that a man should treat common property as common property, and private property as his own. There is no such thing as private property by nature, but things have become private either through prior occupation (as when men of old came into empty territory) or by conquest, or law, or agreement, or stipulation, or casting lots.’ (Roman. Cicero, De Off. 1. vii)
