In Chapter 13 of the Leviathan on “The Natural Condition, of Mankind” is found Hobbes' doctrine of the state of nature as it is generally known. This may be briefly summed up as follows: In faculties of mind and body, men are, on the whole, so nearly equal that one cannot claim for himself any benefit to which another may not pretend as well as he. From this equality of ability arises equality of hope in attaining ends desired. “And therefore if any two men desire the same thing, which nevertheless they cannot both enjoy, they become enemies.” There are three principal causes of quarrel among men; first, the desire for gain; second, for safety, and third, for glory. Hence where there is no common power to keep men in awe, “they are in that condition called war, and such a war as is of every man against every man.” This war need not be constant conflict, since “the nature of war consists not in actual fighting, but in the known disposition thereto during all the time there is no assurance to the contrary.” In such a state of war, actual or potential, the condition of man is most unfortunate and deplorable. “The life of man in such a state,” says Hobbes, “is solitary, poor, nasty, brutish, and short.”