Excerpt from The Life of St. Antony:

And he said they often appeared as the Lord revealed the devil to Job, saying, "His eyes are as the morning star. From his mouth proceed burning lamps and hearths of fire are east forth. The smoke of a furnace blazing with the fire of coals proceeds from his nostrils. His breath is coals and from his mouth issues flames." When the prince of the demons appears in this wise, the crafty one, as I said before, strikes terror by speaking great things, as again the Lord convicted him saying to Job, for "he counteth iron as straw, and brass as rotten wood, yea he counteth the sea as a pot of ointment, and the depth of the abyss as a captive, and the abyss as a covered walk." And by the prophet, "the enemy said, I will pursue and overtake ," and again by another, "I will grasp the whole world in my hand as a nest, and take it up as eggs that have been left." Such, in a word, are their boasts and professions that they may deceive the godly. But not even then ought we, the faithful, to fear his appearance or give heed to his words. For he is a liar and speaketh of truth never a word. And though speaking words so many and so great in his boldness, without doubt, like a dragon he was drawn with a hook by the Saviour, and as a beast of burden he received the halter round his nostrils, and as a runaway his nostrils were bound with a ring, and his lips bored with an armlet. And he was bound by the Lord as a sparrow, that we should mock him. And with him are placed the demons his fellows, like serpents and scorpions to be trodden underfoot by us Christians. And the proof of this is that we now live opposed to him. For he who threatened to dry the sea and seize upon the world, behold now cannot stay our discipline, nor even me speaking against him. Let us then heed not his words, for he is a liar: and let us not fear his visions, seeing that they themselves are deceptive. For that which appears in them is no true light, but they are rather the preludes and likenesses of the fire prepared for the demons who attempt to terrify men with those flames in which they themselves will be burned. Doubtless they appear; but in a moment disappear again, hurting none of the faithful, but bringing with them the likeness of that fire which is about to receive themselves. Wherefore it is unfitting that we should fear them on account of these things; for through the grace of Christ all their practices are in vain.