So says Hobbes in Leviathan, tautologically. In some sense every covenant is extorted by fear. When you do something because of so-called "positive reinforcement" you're doing it because you fear you won't get the reward if you don't. Both factors are in play simultaneously, and further, are inextricably related.
Hobbes goes on to explore several philosophical theories extrapolated from failed attempts to match his contrived vocabulary with the intricacies of the mind. Assigning the product of human imagination to two distinct, mutually exclusive categories, "simple imagination" and "complex imagination" serves as a stark example.
I don't see the merit in examining relationships between make-believe concepts conjured by Hobbes' "complex" imagination.
