10 This plentiful harvest of souls has been gathered by hosts of missionaries--priests, religious (both men and women), catechists, and lay assistants--with an infinite toil and sacrifice whose value, unknown to men, is known only to God Himself. We are happy to offer Our congratulations to these good people, one and all, and to open Our grateful heart to them on this occasion; for the Church has abundant reason for taking a holy pride in the achievements of her missionaries, who are doing their duty in Africa and wherever else they have an opportunity.
Source: Fidei Donum (Vatican.va)