Declare his glory among the Gentiles: his wonders among all people. (Psalm 95:3 DR)
There is no salvation outside the Church (extra ecclesiam nulla salus), which is the promise that there is salvation inside the Church. This reality is undergirded by the Church as the Mystical Body of our Lord Jesus Christ, Who is the Head of that same Body and the fulness of truth Incarnate and the only way to the Father as the Way, the Truth and the Life.
The Church's proclamation of the Gospel is thus a mission born out of her freedom from captivity and vivified by the Holy Ghost. She is to declare God's glory and wonder among all nations, whom God has reconciled to Himself to the blood of our Lord Jesus Christ, and the failure of her members to do so (especially those with the authority to preach and teach) or their preaching of a Gospel other than that fullness of her doctrines and dogmas leaves them accursed, as St. Augustine will describe.
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