Nevertheless, Whitehead is quite candid about the distinctive features of propositions. In "The Metaphysical Scheme of March 1927," Whitehead clarifies a proposition as an "intermediate universal" (MS 320). Of course, with the explication of propositions as intermediate universals, we can recognize Whitehead’ s insistence on describing propositions from the perspective of eternal objects, and to this extent his description remains incomplete. Put differently, the expression "intermediate universal" signals an approach to propositions from the "top down" and not from the "bottom up," that is, from the perspective of actual entities or actual occasions invested with indeterminacy.1 Nonetheless, such a qualification marks a pointed move towards a distinction between propositions and eternal objects.
A proposition differs from an eternal object insofar as the latter refers to actuality with abstract generality, and the former refers to actuality with incomplete abstraction from determinate actual entities. Whereas eternal objects abstract from all determinate actualities, even God, and are merely referent to any actual entity devoid of selection, propositions circumscribe actual entities and lose their absolute generality in the fusion of eternal objects with a set of actual entities. In a proposition the eternal object is restricted to ‘lust these" actual occasions. The proposition is the potentiality of the eternal object, as determinant of definiteness, in some determinate mode of restricted reference to a circumscribed set of actual occasions (PR 257/393, 261/398-9).
For Whitehead, then, a proposition is truly "intermediate," not merely with respect to eternal objects, but also with regard to actual entities. A proposition is not a pure essence; though it does not give information as to how it actually functions in particular instances (like an eternal object) it does gesture towards how it could function in concrete occasions. A proposition is not a particular; it transcends brute fact, just enough to grant it an air of "impartiality" (MS 320-1; PR 197/299-300). Compared to eternal objects a proposition shares in the concrete particularity of actual occasions, and compared to actual occasions, it participates in the abstract generality of eternal objects. In other words, a proposition is doubly intermediate by virtue of what Whitehead calls a "double elimination." On the one hand, the objectified sheer matter-of-factness of actual entities is lifted, leaving a sufficient quality of concrete givenness to allow the latter to function now as "indicators." On the other hand, the eternal object suffers the removal of its absolute generality of its reference to any actuality.
- Anthony J. Steinbeck, "Whitehead's "Theory" of Propositions"