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Thus, for example, whether or not I assume the truth of a certain kind of theism is optional, even if assuming its truth is logically necessary to making or implying the assertion that Jesus is the Christ, i.e., the Messiah of God. But there is nothing optional about my presupposing that something exists or that what exists is either a contingently existing part of the whole or else the necessarily existing whole itself, i.e., the strictly ultimate reality about which theism of this or any other kind is a theory.

Wiki MarkupCf. R.G. Collingwood, _Faith and Reason_: 138 f., 144: "'Why do we believe that there are laws of nature?' 'Why do we believe that if conclusions follow from true premises they are themselves true?' To these questions people sometimes thoughtlessly reply, 'They are mere assumptions.' It is a thoughtless answer because it is made without reflecting on the meaning of the word 'assumption.' An assumption is an optional thing; if I assume _x_ = 12, that implies that I might have assumed _x_ = 13. But if we try, we shall find that we cannot assume that there are not laws of nature or that untrue conclusions follow from true premises.... The only right answer to questions of this kind is: 'Because we know that it is so.' And if we are asked 'How do you know?' we must reply: 'That is an illegitimate question, because it implies that we ought to have reasons for these pieces of knowledge, which we haven't, and, in the nature of the case, do not need.' If then we are told that this reduces them to mere matters of faith, we shall reply, 'Not at all: faith they are, but not mere faith, because the faith which they express is a rational faith in the sense that it is universal in everyone---even in you, who pretend to doubt it---and necessary to all thought, even the thought by which you pretend to criticize it.... Whatever may be said about the _details_ of the world, there is always something that may be said about the world _as a whole_, namely, that it _is_ a whole: a whole within which all distinctions fall, outside which there is nothing, and which, taken as a whole is the cause of itself and of everything in it. The details of the world are the proper theme of scientific thought; but its characteristics as a whole, its unity and the implications of that unity, are not matters of scientific inquiry. They are, rather, a foundation on which all scientific inquiry rests. If it was possible to deny them---which it is not-scientific inquiry would instantly cease.... We thus possess certain pieces of knowledge about the world which we did not acquire, and cannot criticize, by scientific methods. The knowledge in question is our knowledge of the world, not in its details, but as a whole. And not only is it not acquired by scientific thought, but it is the very foundation of such thought; for only insofar as we know, for instance, that there are laws of nature, can we reasonably devise methods for discovering them.... The finite is nothing except as part of a whole.... Unless there is a whole, a universe, an infinite, there is no science; for there is no certainty beyond the certainty of mere observation and of bare particular fact; whereas science is universal or nothing, and is bankrupt unless it can discover general laws. But this discovery, as every student of logic knows, rests on presuppositions \ [_sic\!_\] concerning the nature of the universe as a whole---laws of thought that are at the same time laws of the real world, not scientifically discovered but embraced by an act of faith, of necessary and rational faith."

Wiki MarkupCf. also E. M. Adams, "The Philosophical Grounds of the Present Crisis of Authority," in _Authority: A Philosophical Analysis_, ed. R. Baine Harris (University, AL: The University of Alabama Press, 1976): 11 f.: "\[W\]e need to distinguish between philosophical assumptions and presuppositions. For our purposes, we may regard an assumption as a belief taken for granted and built on as a premise or ground in one's thinking about something else; whereas a presupposition is a necessary condition for the truth or meaningfulness of some sentence. A philosophical assumption on which a scientific or normative theory is built will be presupposed by that theory. But not all philosophical presuppositions make their entry via assumption. Those that do not are the basic ones that provide the ultimate touchstone for philosophy. If a philosophical theory is assumed or taken for granted and thereby shapes the development of a given area of thought, the rejection of that theory in favor of another, whether brought about by philosophical inquiry or otherwise, would work a radical change in the cultural area concerned. On the other hand, the philosophical presuppositions of our primary ways of experiencing, thinking, and talking, those that do not enter the fabric of experience and thought via assumption, cannot be rejected by virtue of inconsistency with philosophical theory. Whenever such inconsistencies arise, so much the worse for the philosophical theory. This is why philosophy must be primarily responsible to the philosophical presuppositions of ordinary discourse rather than those of the specialized disciplines. The latter are more likely to have been influenced by philosophical assumptions pervasive in the culture. Although philosophy does not contradict specific statements in science or judgments in normative thought, it may overturn them by contradicting philosophical assumptionsd on which they are based."

3 September 1998; rev. 15 November 2004