Whoever uses force without Right ... puts himself into a state of War with those, against whom he uses it, and in that state all former Ties are canceled, all other Rights cease, and every one has a Right to defend himself, and to resist the Aggressor.
John LockeWhosoever is found variable, and changeth manifestly without manifest cause, giveth suspicion of corruption: therefore, always, when thou changest thine opinion or course, profess it plainly, and declare it, together with the reasons that move thee to change.
John LockeAs much land as a man tills, plants, improves, cultivated, and can use the product of, so much is his property. He by his labour does, as it were, enclose it from the common.
John Locke