See this worth-it book & ebook:

The Spirit of Catholicism is a work of high theology written for a lay audience, eschewing technical terms for lucid and often beautifully poetic language. It is widely acknowledged to be one of the best introductions to Catholic Christianity available today; even George Orwell, non-believing but fair-minded (unlike many nowadays, alas), praised it in his own snarky way. Thus, it comes highly recommended by leading lay evangelists like Scott Hahn, a convert from Protestantism, and Dave Armstrong, who describes it as “perhaps the best book written about the Catholic Church in the 20th century. Must reading for Catholic and non-Catholic alike”.

In The Spirit of Catholicism, Karl Adam presents a panoramic view of the Catholic Faith from the perspective of the Incarnation, the revelation that God the Son became man in Jesus Christ for humanity’s salvation. The Incarnation shows that, even as salvation is entirely a Divine act, it is carried out through human freedom and cooperation: God the Son saved man by living and dying as a man; He shares this salvation with humanity through a community of human beings, the Church; and He supernaturally joins individuals to Himself through means appropriate to our spiritual and material life, which are called sacraments. In Chapter VII, Adam writes:

“The Catholic cannot think of the good God without thinking at the same time of the Word made Flesh, and of all His members who are united to Him by faith and love in a real unity. The God of Catholicism is the transcendent, absolute God, who became Man for us in His Son, and therefore no solitary God, but the God of angels and saints, the God of fruitfulness and abundance, the God who with a veritable divine folly by the incomprehensible decree of His most free Will takes up into Himself the whole creation that culminates in human nature, and in a new, unheard of supernatural manner, “lives in it,” “moves” in it, and in it “is” (cf. Acts XVii, 28).”

Adam shows the essence of salvation to be communion, a share in the supernatural life of Christ that is given to us through the Church, “which is His body, the fullness of Him who fills all in all” (Ephesians 1:22-23), which baptizes us into the body of Christ (1 Corintians 12:12-13) and shares with us His life through sacraments like the Eucharist (John 6:52). Nor is salvation a solitary relationship between God and the individual; rather, it is the Christian’s adoption into a family of love, among fellow-children of the Father who, being in the body of Christ, share in His Sonship. Adam writes in Chapter VIII:

“As our Lord, in the great prayer which He taught His disciples, joined all who pray into a single unity and directed them to appeal out of this unity to their common Father, and as St. Paul especially enjoined prayer for one another (Rom. xv, 30; 2 Cor. i, 11; Eph. i, 15, etc.), so the Church prays, not in the name of any individual, nor as the mere sum of all individuals, but as a fellowship, as a priestly unity, as the visible priesthood of Christ.

“It is not I and you that pray, but the mystical Christ…”

This emphasis on the role of the Church as the whole Christ would become the ecclesiology of the encyclical Mysticum Corpus Christi (1943). Although it was downplayed after the “people of God” imagery of the 1960s returned the emphasis to the juridical, rather than the mystical, nature of the Church, Adam’s ecclesiology remains influential; and we ourselves think that it helped pave the way for the rise of modern covenant ecclesiology and for Pope Benedict XVI’s emphasis on communion as the nature of the Church.

Re-posted from our 10 April 2011 post on the Eve of the Solemnity of the Most Holy Trinity.

“These things Jesus spoke, and lifting up his eyes to heaven, he said; Father, the hour is come, glorify thy Son, that thy Son may glorify thee… I have manifested thy name to the men whom thou hast given me out of the world. Thine they were, and to me thou gavest them: and they have kept thy word…  Sanctify them in truth. Thy word is truth. As thou hast sent me into the world, I also have sent them into the world…  And not for them only do I pray, but for those also who through their word shall believe in me.

That they all may be one, as thou, Father, in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me: And the glory which thou hast given me, I have given to them: that they may be one, as we also are one.  I in them, and thou in me: that they may be made perfect in one: and the world may know that thou hast sent me, and hast loved them, as thou hast also loved me.” (St. John xvii, 1, 6, 17-18, 20-23)