Excerpt from The Life of St. Antony:

I should have liked to speak no further and to say nothing from my own promptings, satisfied with what I have said: but lest you should think that I speak at random and believe that I detail these things without experience or truth; for this cause even though I should become as a fool, yet the Lord who heareth knoweth the clearness of my con science, and that it is not for my own sake, but on account of your affection towards me and at your petition that I again tell what I saw of the practices of evil spirits. How often have they called me blessed and I have cursed them in the name of the Lord! How often have they predicted the rising of the river, and I answered them, "What have you to do with it?" Once they came threatening and surrounded me like soldiers in full armour. At another time they filled the house with horses, wild beasts and creeping things, and I sang: "Some in chariots and some in horses, but we will boast in the name of the Lord our God ;" and at the prayers they were turned to flight by the Lord. Once they came in darkness, bearing the appearance of a light, and said, "We are come to give thee a light, Antony." But I closed my eyes and prayed, and immediately the light of the wicked ones was quenched. And a few months after they came as though singing psalms and babbling the words of Scripture, "But I like a deaf man, heard not." Once they shook the cell with an earthquake, but I continued praying with unshaken heart. And after this they came again making noises, whistling and dancing. But as I prayed and lay singing psalms to myself they forthwith began to lament and weep, as if their strength had failed them. But I gave glory to the Lord who had brought down and made an example of their daring and madness.