So that in the first place, I put for a general inclination of all mankind a perpetual and restless desire of Power after power, that ceaseth only in Death. And the cause of this is not always that a man hopes for a more intensive delight than he has already attained to, or that he cannot be content with a moderate power: but because he cannot assure the power and means to live well, which he hath present, without the acquisition of more.

The First Part, Chapter 11, p. 47. - Leviathan (1651)