Habermas and Apel commonly defend a form of universal moral theory that is also postmetaphysical. Still, they differ with respect to both the character and the justification of a universal moral principle. Habermas denies and Apel asserts that this principle is a transcendental condition of life practice or human activity as such, and each criticizes the claims of the other. This paper argues that each is correct in his criticism of the other and, therefore, both are wrong. The contention between (...) them cannot be resolved within the post metaphysical conviction they have in common, and the reasons for this conclusion imply that a universal moral principle cannot be redeemed independently of metaphysics. (shrink)