Alasdair MacIntyre on incommensurability in the human sciences

"Each warring position characteristically appears irrefutable to its own adherents; indeed in its own terms and buy its own standards of argument it is in practice irrefutable. But each warning position equally seems to its opponents to be insufficiently warranted by rational argument. It is ironic that the holy secular humanist disciplines of the late twentieth century should thus reproduce that very same condition which lead their 19th century secularizing predecessors to dismiss the claim of theology to be worthy of the status of an academic discipline." -- The Rival Versions of Moral Enquiry, p. 7