Following Kant, it is clear that, but probably not completely how we are morally obligated. I will point out that there are three possible ways to struggle for an understanding of how we can be obligated as rational beings and also as ordinary human beings. There is the argument from rational feeling, the argument from language, and finally the argument from systematization. Reading the later passages of the ‘Critique of pure Reason’ and following its instructions, we will understand why education (...) has to be founded by the same kind of argumentation as the natural sciences. The systematical analysis of Kant’s analogy between the physical body and the moral obligation will explain the suspected gap between our just rational and our whole selves. The most important part of the demanded bridge will be Kant’s Moral Laboratory. (shrink)