Existentialism and postmodernism have both abandoned the idea of a human nature. Also, the idea of naturalness as a value for education has been targeted as a blind for conservative ideology. There are, however, good reasons to re-establish a sound concept of human naturalness. First of all, the concept does not seem to have disappeared from common usage, despite all criticism. Secondly, the idea of naturalness seems essential to our sense of ourselves and for the formation of our identities. And finally, the idea is the inevitable basis for the possibility of a radical criticism of society and culture. This paper presents two suggestions for a rehabilitation of the concept of naturalness: Gernot Böhme's phenomenology of body and nature, and Christoph Menke's "genealogical reflexion."