The contribution of an ecclesiastical law scholar to the elaboration of bio-law is legitimated by his study and experiences at the border with «not-law» and in relations with the «laws-other» (religious and cultural) distinct from that of the polis. The pattern of complementarity/distinction that the scholar of ecclesiastical law draws from this kind of experience, can contribute to the articulation of bio-law according to procedural justice, which facilitates the concretization of the fundamental value of the dignity of every human reality.