36 This, as we well know, is a mystery, the mystery of the Church. But if we give it our whole-hearted attention, inevitably we will gain much spiritual profit, and the Church of our day would seem to be in the greatest need of such spiritual profit. Christ's presence, His very life, will reveal its power and efficacy in our individual souls and in the whole Mystical Body; and this by the practice of a living and life-giving faith, so that, as St. Paul said in the passage from which We have already quoted, "Christ may dwell through faith in your hearts." (74) It is through faith that we gain this awareness of the mystery of the Church-mature faith, a faith lived out in our lives. Faith such as this gives us a sensus Ecclesiae, an awareness of the Church, and this is something with which the genuine Christian should be deeply imbued. He has been raised in the school of the divine word, nourished by the grace of the sacraments and the Paraclete's heavenly inspiration, trained in the practice of the virtues of the Gospel, and influenced by the Church's culture and community life. He has, moreover, the tremendous joy of sharing in the dignity of the royal priesthood granted to the people of God. (25)
Source: Ecclesiam Suam (Vatican.va)