Christ did not found an abstract religion, a mere school of religious thought. He setup a community of apostles, of teachers, with the task of spreading His message and so giving rise to a society of believers: His Church. He promised the Spirit of truth to His Church and then sent Him.
Pope Paul VIWithout repeating everything that we have already mentioned, it is appropriate first of all to emphasize the following point: for the Church, the first means of evangelization is the witness of an authentically Christian life, given over to God in a communion that nothing should destroy and at the same time given to one's neighbor with limitless zeal. As we said recently to a group of lay people, โModern man listens more willingly to witnesses than to teachers, and if he does listen to teachers, it is because they are witnesses.
Pope Paul VIFor you deal here above all with human life, and human life is sacred; no one may dare make an attempt upon it. Respect for life, even with regard to the great problem of the birth rate, must find here in your Assembly its highest affirmation and its most rational defense. Your task is to ensure that there is enough bread on the tables of mankind, and not to encourage an artificial control of births, which would be irrational, in order to diminish the number of guests at the banquet of life.
Pope Paul VI