... and "fluid" propositions and the relationship between them can change over time so that fluid propositions could become hardened and hardened ones could become fluid. However, the nature of these propositions, the ones that serve as foundations, is unlike ordinary propositions. The propositions or core beliefs that constitute a form of life cannot be enumerated as a set. This would constitute the set of our beliefs, which ground our human ways of living. However, propositions that stand fast for us, such as the claim that the earth existed long before my birth, cannot, it seems be listed as a set. In fact, Wittgenstein claims that the expression "I know" is misused if we think we can enumerate all the propositions that we know. I am aware that certain things stand fast for me but they are not articulated as propositions. I can formulate them into a set if pressed, for ...

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