 Clearly, the soundness of the deductive version of the cosmological argument hinges on whether principles like that of Causation or Sufficient Reason are more than methodologically true and on the extent to which these principles can be applied to things, events, and facts. Critics of the argument will be skeptical regarding the universal application of the principles; defenders of the argument generally not so, at least as limited to contingencies. Perhaps the best one can say, with Taylor, is that even those who critique the PSR (understood broadly that every contingent thing, event, or fact must have a sufficient cause, reason, or ground) invoke it when they suggest that defenders of the principle have failed to provide a sufficient reason for thinking it is true. 