Abstract
A perennial problem in interpreting Hobbes’s moral and political thought in Leviathan has been to square the apparently irreducible normativity of central Hobbesian concepts and premises with his materialism and empiricism. Thus, Hobbes defines a “law of nature” as a “precept or general rule, found out by reason, by which a man is forbidden to do that which is destructive of his life” and the “right of nature” as “the liberty each man hath to use his own power, as he will himself, for the preservation of his own nature”. Both are plainly normative. A law of nature is a precept that tells us what we ought not, or must not, do. And the right of nature tells us what we may do.