Pope John Paul II
Redemptoris Missio §41
Redemptoris Missio: On the Permanent Validity of the Church's Missionary Mandate
41 "Missionary activity is nothing other and nothing less than the manifestation or epiphany of God's plan and its fulfillment in the world and in history; in this history God, by means of missions, clearly accomplishes the history of salvation." What paths does the Church follow in order to achieve this goal? Mission is a single but complex reality, and it develops in a variety of ways. Among these ways, some have particular importance in the present situation of the Church and the world.
Source: Redemptoris Missio (Vatican.va)