If so, it will be clear to you that through this unity, of which your marriage is a part, your marriage is truly indissoluble. Or in other words, just because the smaller unity between you two is subordinated to the greater unity of Christ's Church, the unity between you is steadfast. This is something very remarkable to the nonbeliever. He would think that the more independently a marriage unity is built upon the natural unity of two the firmer it is. That is an error.
Nothing is firm but the eternal.
Everything else is uncertain. Only when we make our marriage bond part of the eternal order is it a firm bond. Thus we come to a surprising paradox. It is clear to us that just this radical question constitutes the deepest security of a marriage bond founded in the eternal order. It places each of the marriage partners completely into the unity of the spirit of the Church, and in doing so, into unconditional faithfulness to one another.