 Moreover, we can see why Kant may have thought that the necessity and universality of moral truths makes them impossible to discover a posteriori. Regarding necessity: observing how things actually go seems insufficient to find out how they must go. And regarding universality: if moral truths are universal in the sense that they are true in all contexts, then one could only verify the truth of a moral claim by (a) experiencing all contexts and (b) perceiving the moral truth in each one. But that is clearly impossible.