RT Journal Article SR Electronic T1 On the univocity of rationality: a response to Nigel Biggar’s ‘Why religion deserves a place in secular medicine’ JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP 870 OP 872 DO 10.1136/medethics-2015-102805 VO 41 IS 11 A1 Xavier Symons YR 2015 UL http://jme.bmj.com/content/41/11/870.abstract AB Nigel Biggar (2015) argues that religion deserves a place in secular medicine. Biggar suggests we abandon the standard rationalistic conception of the secular realm and see it rather as “a forum for the negotiation of rival reasonings”. Religious reasoning is one among a number of ways of thinking that must vie for acceptance. Medical ethics, says Biggar, is characterised by “spiritual and moral mixture and ambiguity”. We acknowledge this uncertainty by recognising rival viewpoints and agreeing to provisional compromises.In this response, I object to Biggar's characterisation of medical ethics as “morally ambiguous” and “provisional”. I argue that Biggar has failed to provide adequate support for his conception of ethics as a “forum for negotiation and compromise”. I criticise Biggar's attempt to ‘pluralise’ rationality, and assert that if religion is to play a role in secular medicine, it must be ready to defend itself against a universal standard of reason. In the second section of my response, I argue that ‘theistic natural law’ gives us the resources to defend using reason alone ostensibly faith-based positions in healthcare ethics. In doing so, we retain a univocal conception of rationality, while at the same time leaving space for ‘theism’ in healthcare ethics.