Ecclesiam Suam §109

¹⁰⁹ And so we come to the circle which is nearest to us, and which comprises all those who take their name from Christ. In this area the ecumenical dialogue, as it is called, is already in being, and there are places where it is beginning to make considerable progress. There is much more that could be said on this complex and delicate matter, but this will not be Our final word on the subject. So for the moment We will merely refer in passing to a few fairly obvious points .