Evangelii Nuntiandi §3

3. We have stressed the importance of this theme of evangelization on many occasions, well before the Synod took place. On June 22, 1973, we said to the Sacred College of Cardinals: "The conditions of the society in which we live oblige all of us therefore to revise methods, to seek by every means to study how we can bring the Christian message to modern man. For it is only in the Christian message that modern man can find the answer to his questions and the energy for his commitment of human solidarity."[7] And we added that in order to give a valid answer to the demands of the Council which call for our attention, it is absolutely necessary for us to take into account a heritage of faith that the Church has the duty of preserving in its untouchable purity, and of presenting it to the people of our time, in a way that is as understandable and persuasive as possible.

7. Paul VI, Address to the College of Cardinals (22 June 1973): AAS 65 (1973), p. 383.