”Mankind only becomes conscious of its unity in breaking loose from, and protesting against, the claims of the Church to be the religious form of unity willed by God. This protest is wider than Protestantism in the narrow sense, but gives it some affinity with the other religions of the world, and so is bound to lead to a kind of entente cordiale between all non-Catholic forms of religion. ‘Anything but this’ is the common watchword by which all non-Catholics easily understand each other. … There is no slogan nearly so suitable for [summing up] all forms of cultural propaganda these days as that which promises to lead men from Catholic ‘narrowness’ into the ‘breadth’ of natural religion. The world-wide unity of the religions is being hammered out on the anvil of Catholicism.”

– Hans Uhrs von Balthasar (”The God Question and Modern Man”)