Congar’s work directly influenced Lumen Gentium (Dogmatic Constitution on the Church) and Unitatis Redintegratio (Decree on Ecumenism) at Vatican II. It also laid groundwork for later popes’ teaching on the Holy Spirit (John Paul II’s Dominum et Vivificantem , 1986). Contemporary theologians (e.g., Kilian McDonnell, Elizabeth Johnson, Veli-Matti Kärkkäinen) still engage Congar as a benchmark.
Critically examines the theological split between the Roman Catholic and Eastern Orthodox traditions.