What characterizes the postmodern condition, then, is not a rejection of grand stories in terms of scope or in the sense of epic claims, but rather an unveling of the fact that all knowledge is rooted in some narrative or myth... The result, however... is what Lyotard describes as a "problem of legitimation"... since what we thought were universal criteria have been unveiled as just one game among many. If we consider, for instance, the reality of deep moral diversity and competing visions of the good, postmodern society is at a loss to adjudicate the competing claims. There can be no appeal to a higher court that would transcend a historical context or a language game, no neutral observer or "God's-eye view" that can legitimate or justify one paradigm or moral language game above another. If all moral claims are conditioned by paradigms of historical commitment, then they cannot transcend those conditions; thus every moral claim operates within a "logic" that is conditioned by the paradigm. In other words, every language game has its own set of rules. As a result, criteria that determine what constitutes evidence or proof must be game relative: they will function as rules only for those who share the same paradigm or participate in the same language game. The incommensurability of language games means that there is a plurality of logics that precludes any demonstrative appeal to a common reason. Recognition of the incommensurability of langauge games and the plurality of competing myths means that there is no consensus, no sensus communis. Many — especially Christians — lament this state of affairs... But is the problem as bad as we think? ... In the face of this problem, we must not lose sight of the fact that what constitutes the postmodern condition is precisely a plurality of language games — a condition in which no one story can claim either universal auto-legitimation (because of the plurality of "the people") nor appeal to a phantom universal reason (because reason is just one myth among others, which is itself rooted in a narrative). And this plurality is based on the fact that each game is grounded in different narratives or myths (i.e. founding beliefs).

Strong scientism is the view that some proposition or theory is true or rational if and only if it is a scientific proposition or theory. That is, if and only if it is a well-established scientific proposition or theory that, in turn, depends upon its having been successfully formed, tested, and used according to appropriate scientific methodology. There are no truths apart from scientific truths, and even if there were, there would be no reason whatever to believe them... [W]eak scientism allows for the existence of truth apart form science and are even willing to grant that they can have some minimal, positive rationality status without the support of science. But, science is the most valuable, most serious, and most authoritative sector of human learning. If strong scientism is true, then theology is not a rational enterprise at all and there is no such thing as theological knowledge. If weak scientism is true, then the conversation between theology and science will be a monologue with theology listening to science and waiting for science to give it support. For thinking Christians, neither of these alternatives is acceptable.

The grounds of those persuasions which are to be found amongst men, so various, different, and wholly contradictory; and yet asserted somewhere or other with such assurance and confidence, that he that shall take a view of the opinions of mankind, observe their opposition, and at the same time consider the fondness and devotion wherewith they are embraced, the resolution and eagerness wherewith they are maintained, may perhaps have reason to suspect, that either there is no such thing as truth at all, or that mankind hath no sufficient means to attain a certain knowledge of it.