Science or Philosophy is divided into Natural or Civil, according as it is knowledge of consequences from the accidents of natural bodies or of politic bodies.
Ethics is one of the ultimate divisions of Natural Philosophy, dealing with consequences from the _passions_ of men; and because the passions are _qualities_ of bodies, it falls more immediately under the head of Physics.

Politics is the whole of the second main division, and deals with consequences from the institution of commonwealths (1) to the rights and duties of the Sovereign, and (2) to the duty and right of the Subject.
Ethics, accordingly, in Hobbes's eyes, is part of the science of man (as a natural body), and it is always treated as such.

But subjecting, as he does, so much of the action of the individual to the action of the state, he necessarily includes in his Politics many questions that usually fall to Ethics.

Hence arises the necessity of studying for his Ethics also part of the civil Philosophy; though it happens that, in the Leviathan, this requisite part is incorporated with the Section containing the Science of Man.
Chapter X.is on Power, Worth, Dignity, Honour, and Worthiness.

A man's _power_ being his present means to obtain some future apparent good, he enumerates all the sources of original and acquired power.