Cardinal Kurt Koch, the President of the Pontifical Council for Promoting Christian Unity, presented an ecumenical "vademecum" � or guidebook � addressed to Bishops and intended to encourage and assist them in the work of ecumenism in their ministry. The handbook, bearing the title, "The Bishop and Christian Unity: an Ecumenical Vademecum," was requested in 2016 by members of the Pontifical Council. It is being issued on December 4, 2020, to mark the 25th anniversary of St John Paul II's landmark encyclical on ecumenism, Ut unum sint, and the 60th anniversary of the establishment of the Council by Pope St John XXIII in 1960.