The great and chief end of men uniting into commonwealths, and putting themselves under government, is the preservation of their property
 Bertrand Russell, A History of Western Philosophy (1945). copy citation

Context

“He makes no qualification, so that if I catch a person engaged in petty pilfering I have, apparently, by the law of nature, a right to shoot him. Property is very prominent in Locke’s political philosophy, and is, according to him, the chief reason for the institution of civil government: “The great and chief end of men uniting into commonwealths, and putting themselves under government, is the preservation of their property; to which in the state of nature there are many things wanting.” The whole of this theory of the state of nature and natural law is in one sense clear but in another very puzzling. It is clear what Locke thought, but it is not clear how he can have thought it.” source