67 We should not like to conclude this Encyclical Letter without addressing Ourselves earnestly to the clergy and all the faithful to express to them particularly Our warm gratitude. We understand that this year also there is a great increase in the generous help and support given by Our children to the missions. Your charity can certainly be employed in no better cause since it is thus destined to propagate the Kingdom of Christ and to bring salvation to so many still outside the Fold. It is the Lord Himself Who "gave . . . to everyone of them commandment concerning his neighbor."
Source: Evangelii Praecones (Vatican.va)