Pope John Paul II
Redemptoris Missio §31
Redemptoris Missio: On the Permanent Validity of the Church's Missionary Mandate
31 The Lord Jesus sent his apostles to every person, people and place on earth. In the apostles, the Church received a universal mission-one which knows no boundaries-which involves the communication of salvation in its integrity according to that fullness of life which Christ came to bring (cf. Jn 10:10). The Church was "sent by Christ to reveal and communicate the love of God to all people and nations." This mission is one and undivided, having one origin and one final purpose; but within it, there are different tasks and kinds of activity. First, there is the missionary activity which we call mission ad gentes , in reference to the opening words of the Council's decree on this subject. This is one of the Church's fundamental activities: it is essential and never-ending. The Church, in fact, "cannot withdraw from her permanent mission of bringing the Gospel to the multitudes the millions and millions of men and women-who as yet do not know Christ the Redeemer of humanity. In a specific way this is the missionary work which Jesus entrusted and still entrusts each day to his Church."
Source: Redemptoris Missio (Vatican.va)