“Logic may be conceived as ruling out what is absolutely impossible, and thus determining the field of what in the absence of empirical knowledge is abstractly possible.” PossibilityLogic Book:An Introduction to Logic and Scientific Method Source: An Introduction to Logic and Scientific Method
“Yet it is unassailably true that so long as we lack omniscience and do not know all of the future, all our generalizations are fallible or only probable. And the history of human error shows that a general consensus, or widespread and unquestioned feeling of certainty, does not preclude the possibility that the future may show us to be in error.” CertaintyErrorOmniscienceGeneralizationsProbableFallible Book:An Introduction to Logic and Scientific Method Source: An Introduction to Logic and Scientific Method