"Apostolicam Actuositatem", the Second Vatican Council's "Decree on the Apostolate of the Laity", was issued 18 November 1965. The purpose of this document was to encourage and guide lay people in their Christian service. "Since the laity, in accordance with their state of life, live in the midst of the world and its concerns, they are called by God to exercise their apostolate in the world like leaven, with the ardor of the Spirit of Christ." Francis Cardinal Arinze explains that lay persons "...are called by Baptism to witness to Christ in the secular sphere of life; that is in the family, in work and leisure, in science and cultural, in politics and government, in trade and mass media, and in national and international relations".