City of God

Plotinus, whose memory is quite recent, enjoys the reputation of having understood Plato better than any other of his disciples. In speaking of human souls, he says, “The Father in compassion made their bonds mortal;” that is to say, he considered it due to the Father's mercy that men, having a mortal body, should not be forever confined in the misery of this life. But of this mercy the demons have been judged unworthy, and they have received, in conjunction with a soul subject to passions, a body not mortal like man's, but eternal.

For they should have been happier than men if they had, like men, had a mortal body, and, like the gods, a blessed soul. And they should have been equal to men, if in conjunction with a miserable soul they had at least received, like men, a mortal body, so that death might have freed them from trouble, if, at least, they should have attained some degree of piety. But, as it is, they are not only no happier than men, having, like them, a miserable soul, they are also more wretched, being eternally bound to the body; for he does not leave us to infer that by some progress in wisdom and piety they can become gods, but expressly says that they are demons forever.