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“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.”
― Morris F. Cohen, An Introduction to Logic and Scientific Method

“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.”
― Morris F. Cohen, An Introduction to Logic and Scientific Method

“Many remarkable advances in knowledge have resulted from our questioning the truth of propositions which we previously regarded as “self-evident.â€� And a critical study of human beliefs reveals how much “interpretationâ€� is present in what at first sight seems like “immediate knowledge.”
― Morris F. Cohen, An Introduction to Logic and Scientific Method