When, however, the body of Christ is called the mystical body on account of the mystery of the heavenly marriage between Christ and the church, the body of the devil is not likewise mystical but dark, because to be joined with the devil as one of his members does not express itself directly in mystery but in the scourge. Thus the body of the devil has something natural about it, because, as Augustine says, de natura Boni, all evil must root itself in the good, so all evil in morals is founded in what is good by nature. And besides having that which is natural, the body of the devil has the essence of vice, just as the mystical body of Christ has the essence of virtue. Hence St. Augustine denies, de doct. Christi, III [Nic. Fathers, 2: 569], that the body and members of Christ are one in the same sense as the members of the devil are one.
Now, if it be asked what is the form in which the members of the devil are united in that body, the answer is that there is an outer form and an inner deformity. The outer form is God's eternal foreknowledge which knows and ordains all the foreknown members of that diabolical body to be bound to perpetual punishment. But the inner deformity is the final disobedience or pride, which the saints call the guilt of final impenitence or the sin against the Holy Spirit. And so the same sin both continues on and disjoins. For it holds on in the members of the devil, binding them together in their wickedness for Tartarus and separating them from the companionship of the blessed, just as heat, first dissolving a mixture, gathers together the homogeneous parts, making each element of the dissolved mixture to seek its own place. But it separates the heterogeneous constituents, when it dissolves what seems on the surface to be harmonious by resolving the parts of the mixture, each into its original, separate element. For in the day of judgment, by the contrary principles, the coldness of the devil's body and the heat of the love of Christ's body, the bipartite body must be dissolved according to the
