This Handbook offers practical suggestions for implementing and strengthening spiritual ecumenism, the heart of all efforts to re-unite divided Christians. It is grounded in the documents that have shaped the Catholic Churchs engagement in seeking Christian unity, those of the Second Vatican Council, as well as others such as the encyclical Ut Unum Sint and the Catechism of the Catholic Church. A Handbook of Spiritual Ecumenism is written for anyone who values deeply the restoration of Christian unity, especially those responsible for promoting it at various levels of Church life. Cardinal Kasper extends a loving invitation to Christians of all traditions, encouraging them to join their Catholic brothers and sisters in prayer and action for unity.