The Damnation Of Wicked Spirits

Spiritalis namque substantia, nec ulla carnis soliditate devincta, ut excusationem exortae in se pravae non recipit voluntatis, ita veniam malignitatis excludit, quia nulla quemadmodum nos ad peccandum impugnatione carnis extrinsecus lacessita est, sed vitio solius malae voluntatis accensa, et ob hoc sine venia peccatum et languor sine remedio est. Sicut enim nulla sollicitante terrena materia corruit, ita nec indulgentiam quidem aut locum poenitudinis obtinere potest. Quibus ex rebus evidenter colligitur quod non solum noxia non sit haec quae contra se invicem suscitatur in nobis carnis spiritusque contentio, verum etiam multam nobis conferat utilitatem. Sanctus Ioannes Cassianus, Collationes, Collatio IV, Caput XIV Source: Migne PL 49.602a-603a

Now a purely spiritual substance, one that is not tied to any material flesh, has no excuse for an evil thought which rises up in it, which also excludes forgiveness for wickedness, because it is not provoked to sin as we are by the assaults of the external flesh, but is inflamed only by the fault of a perverse will, and therefore its sin is without forgiveness and its weakness is without remedy. For as it does not fall because of an attraction of earthly matter, so it can find no pardon or place of repentance. From which we may clearly gather that this dispute which we have in us of the flesh and spirit against one another 1 is not merely harmless, but in truth extremely useful to us. Saint John Cassian, Conferences, Conference 4, Chap 14 1 cf Galat 5.17