Hobbes believed that the primary purpose for which societies are formed was to enhance the ability to protect oneself, and as such, the first law of nature could never be compromised, altered or diminished by any contract establishing that society. This right was so fundamental that it was deemed unalienable: “A covenant not to defend myself from force, by force, is always void.”

James R. Schaller
D.C. v. Heller
Brief of International Scholars as amici curiae in support of respondent.
[Having not read Hobbes (shame on me) I have always said this differently. Instead I have said, “Self defense is a right all species on this planet have claimed for all time.” This brief is interesting for other reasons as well. They explain in great detail how the anti-gun bigots who filed briefs in support of the D.C. gun ban are also liars.–Joe]