The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ?
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Paul called it a cup of blessing, because as we hold it in our hands we exalt him in our hymns, wondering and marveling at his unspeakable gift, blessing him for having poured out this draft so that we might not abide in error, and not only for having poured it out but also for having imparted it to us all. This is what lovers do. When they see those whom they love desiring what belongs to strangers and despising their own, they give what belongs to themselves and so persuade them to turn away from the gifts of those others.