 His book on the whole council, "After the Council", was among the first to be published by a non-Catholic author.Schlink's study of Christian baptism was a major resource for the WCC's ground-breaking document, "Baptism, Eucharist, and Ministry".His 804-page "Ecumenical Dogmatics", which contains prefaces by both a Roman-Catholic theologian (Heinrich Fries) and an Eastern Orthodox one (Nikos Nissiotis), "seeks to overcome basic dogmatic misunderstandings among the churches and to identify essential convergences in an effort to pave the way toward visible reunion of broken Christendom."