Evangelii Nuntiandi §51

51. To reveal Jesus Christ and His Gospel to those who do not know them has been, ever since the morning of Pentecost, the fundamental program which the Church has taken on as received from her Founder. The whole of the New Testament, and in a special way the Acts of the Apostles, bears witness to a privileged and in a sense exemplary moment of this missionary effort which will subsequently leave its mark on the whole history of the Church.

She carries out this first proclamation of Jesus Christ by a complex and diversified activity which is sometimes termed "pre-evangelization" but which is already evangelization in a true sense, although at its initial and still incomplete stage. An almost indefinite range of means can be used for this purpose: explicit preaching, of course, but also art, the scientific approach, philosophical research and legitimate recourse to the sentiments of the human heart.