Suddenly it becomes plain that what divides Christians and men generally are precisely the specifically Catholic things. (Wasn't Our Lord himself a sign of contradiction and a stumbling-stone?) Kasper tells us that ecumenism is not a movement towards conversion; it is not the return of wanderers who have left the one true fold. This idea of unity is foreign to him.
E subito appare che sono proprio gli elementi specificamente cattolici che dividono i cristiani e gli uomini (non è forse Nostro Signore segno di contraddizione, pietra d inciampo?).