 A further difficulty for the unified view is that even if Hobbes did see the connection between, say, physics and moral philosophy as deductive, it is not obvious how that deduction would work because moral philosophy must add content about human passions (endeavors) that is not contained within—and thus not deducible from—physics. For example, although the concept ‘endeavor’ is introduced in physics, for it to be used in moral philosophy the concepts of ‘appetite’ and ‘aversion’, which are properties of human bodies, must be added to it for use (Malcolm 2002: 147). One way to avoid this difficulty for the unified view would be to provide evidence that Hobbes made explicit the reduction relationship between concepts like ‘appetite’ and ‘aversion’ and the concept of ‘endeavour’, showing how one can reduce claims about human bodies to claims about microscopic bodies. Hobbes does not appear to do this anywhere in the corpus. However, even if a strong version of the unified view faces this difficulty, the presence of ‘endeavor’ throughout Hobbes’ philosophy shows that it was a foundational concept (see Jesseph 2016).