If he [the metaphysician] takes an empiricist position in regard to the source of knowledge and a realist one in regard to the limits of knowledge, he will see no need or even possibility of seeking a world-view other than that provided by science as based on experience. If he inclines towards an aprioristic position, or even more, if he is convinced by the arguments of irrationalists, he will seek his world-view in an aprioristic way, or he will appeal to intuition or mystical experience

p. 166–167, as cited in Łukasiewicz, 2016. - Problems and theories of philosophy, 1949