Cardinal Darío Castrillón Hoyos, prefect of the Congregation for the Clergy, will introduce the address, starting at noon Roman time. The addresses can be followed live or recorded at www.clerus.org.

Catholic Archbishop Tadeusz Kondrusiewicz of Moscow has worked to ensure Russian participation in the event. He did so at the request of the Vatican congregation, which organizes the worldwide videoconferences.

Theologians from Italy, Spain, the United States, the Philippines, Colombia, Germany, Taiwan, Australia and South Africa will discuss the post-Vatican II thought on four sacraments: holy orders, reconciliation, marriage and anointing of the sick.