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The Church has taught in every age that man’s soul is engaged in warfare with unseen powers. St. Paul’s words in Ephesians vi. 11, 12, are impressively rendered by Dr. Moffatt: “Put on God’s armour so as to be able to stand against the stratagems of the devil. For we have to struggle not with blood and flesh, but with the Angelic Rulers, the Angelic Authorities, the potentates of the dark present, the spirit-forces of evil in the heavenly sphere.”

There is no stranger, more disputed, passage in Dante’s “Purgatorio” than that in which the poet represents the evil serpent seeking to gain access to the penitents on the lower slopes of the Mount. Sinless they are, but they have not reached the terraces of suffering; they are waiting, pale and humble, for permission to move upward at daybreak, and they sing the compline hymn.

Guardian angels come at once to the defence of those whose rest in the flowery dell is disturbed by thoughts of the adversary. These angels, as Maria Rossetti says, are “green-winged and robed for hope, golden-haired and radiant-visaged for glory, with fiery swords against the lurking serpent, with blunted swords towards the reposing elect, falcons to watch, falcons to fly, moved swifter than seen to move.”

Those penitents of Dante’s “Dell of Princes” would have echoed the words with which John Bunyan closed the first part of the “Pilgrim’s Progress”: “I saw that there was a way to hell even from the gates of heaven, as well as from the city of destruction.” Would they not, as the dawn-light guided them upward to St. Peter’s gate, have warned Christian souls on earth against any tampering with “spirit-forces of evil”?

“Principalities and powers,

Mustering their unseen array,

Wait for thy unguarded hours;

Watch and pray.”