86 It gives Us, Venerable Brethren, an inward strength, a heavenly joy, for which We daily render to God Our deep and humble thanks, to see in every region of the Catholic world evident signs of a spirit which boldly faces the gigantic tasks of our age, which with generous decision is intent on uniting in fruitful harmony the first and essential duty of individual sanctification, and apostolic activity for the spread of the Kingdom of God. From the movement of the Eucharistic Congresses furthered with loving care by Our predecessors and from the collaboration of the laity formed in Catholic Action towards a deep realization of their noble mission, flow forth fountains of grace and reserves of strength, which could hardly be sufficiently prized in the present time, when threats are more numerous, needs multiply and the conflict between Christianity and anti-Christianism grows intense.
Source: Summi Pontificatus (Vatican.va)