Editing Unitatis redintegratio (section)

==Description==
''Unitatis Redintegratio'' calls for the reunion of Christendom and is similar to a previous call for unity by [[Pope Leo XIII]] in his 1894 [[encyclical letter]] ''[[Praeclara gratulationis publicae]]'' and by Pope Pius IX in his encyclical ''[[In Suprema Petri Apostoli Sede]]''. However, ''Unitatis'' articulates a different kind of [[ecclesiology]] from ''Praeclara''. It focuses on the unity of the [[people of God]] and on separated Christian brethren rather than insisting according to the classical formulation that schismatics must return to the fold under the unity of the [[Vicar of Christ]].

''Unitatis'' acknowledges that there are serious problems facing prospects of reunion with Reformation communities that make no attempt to claim [[apostolic succession]] as the Anglican communion does. Ecclesial communities which adhere to [[Calvinism]] are a particularly challenging case because they and Catholicism have important doctrinal differences on key issues such as [[ecclesiology]], [[liturgy]] and [[mariology]]. Other communities have insoluble doctrinal differences with Catholic Christianity because their theology of the [[Holy Trinity]] is manifestly incompatible with the doctrine as articulated by the [[First Council of Nicaea|council of Nicaea]] in the early Church.