This insightful study offers the first comprehensive overview of the theology and praxis of Roman Catholic theologian Heribert Muhlen. This theologically accurate and historically sensitive book shows that Muhlen has gone beyond his popular early academic exercise by documenting and proposing a liturgical praxis that aims at providing a concrete framework for the acceptance and renewal of the human covenantal relationship with God. In every respect, Muhlen's theology and praxis marks the beginning of a new profile of the Church. A letter and epilogue by Heribert Muhlen are included.