37 So much for the subject of Our letter, Venerable Brethren, and it is Our confident hope that both you yourselves and, at your instigation, all Our sons throughout the world, both clerical and lay, will give a whole-hearted and generous response to Our fatherly appeals. Everyone wants the forthcoming Ecumenical Council to give all possible impetus to the spread of Christianity. It must give louder and louder utterance to that "word by which the kingdom is preached" mentioned in the parable of the sower,(37) and help to bring about the wider extension of "the kingdom of God" in the world. But all this must depend to a large extent on the dispositions of the souls which the Council will be endeavoring to inspire to truth and virtue, to the worship of God both in private and in public, to a disciplined life and to missionary zeal.
Source: Paenitentiam Agere (Vatican.va)