This is why I have a gun
"No kingdom can be secured otherwise than by arming the people. The possession of arms is the distinction between a freeman and a slave. He, who has nothing, and who himself belongs to another, must be defended by him, whose property he is, and needs no arms. But he, who thinks he is his own master, and has what he can call his own, ought to have arms to defend himself, and what he possesses; else he lives precariously, and at discretion."
James Burgh (1714-1775) was an English Whig politician
Source: "Political Disquisitions: Or, an Enquiry into Public Errors, Defects, and Abuses" (London, 1774-1775)