One thing must move us forward on this journey. What is in play at the beginning of the third millennium, is not the same as what was in play at the beginning of the second millennium, when there was the separation of East and West; nor is it the same as what was in play in the middle of the same millennium when there was the separation of Catholics and Protestants. Can we say that the way the Holy Spirit proceeds from the Father or how justification of the sinner comes about are the problems that impassion the men of today and with which the Christian faith stands or falls? The world has moved beyond us and we remain fixed by problems and formulas that the world does not even know the meaning of.
In battles in the Middle Ages there was a moment in which, after the infantry, archers and cavalry had been overwhelmed, the melee began to circle around the king. There the final outcome of the fight was decided. Today the battle for us also takes place around the king. There are buildings and structures made of metal in such a way that if a certain neuralgic point is touched or a certain stone is removed, everything falls apart. In the edifice of the Christian faith this cornerstone is the divinity of Christ. If this is removed, everything falls apart and faith in the Trinity is the first to go.
From this we see that today there are two possible ecumenisms: an ecumenism of faith and an ecumenism of incredulity; one that unites all those who believe that Jesus is the Son of God, that God is Father, Son and Holy Spirit, and that Christ died to save all humankind, and an ecumenism that unites all those who, in deference to the Nicene Creed, continue to proclaim these formulas but empty them of their content. It is an ecumenism in which, in its extreme form, everyone believes the same things because no one any longer believes anything, in the sense that “believing” has in the New Testament.
“Who is it that overcomes the world,” John writes in his first letter, “if not those who believe that Jesus is the Son of God?” (1John 5:5). Sticking with this criterion, the fundamental distinction among Christians is not between Catholics, Orthodox and Protestants, but between those who believe that Christ is the Son of God and those who do not believe this.