How he saw in a vision the present doings of the Arians.
82 Being known to be so great a man, therefore, and having thus given answers to those who visited him, he returned again to the inner mountain, and maintained his wonted discipline. And often when people came to him, as he was sitting or walking, as it is written in Daniel, he became dumb, and after a season he resumed the thread of what he had been saying before to the brethren who were with him. And his companions perceived that he was seeing a vision. For often when he was on the mountains he saw what was happening in Egypt, and told it to Serapion the bishop, who was indoors with him, and who saw that Antony was wrapped in a vision.
Once as he was sitting and working, he fell, as it were, into a trance, and groaned much at what he saw. Then after a time, having turned to the bystanders with groans and trembling, he prayed, and falling on his knees remained so a long time. And having arisen the old man wept. His companions, therefore, trembling and terrified, desired to learn from him what it was. And they troubled him much, until he was forced to speak. And with many groans he spoke as follows: 'O, my children, it were better to die before what has appeared in the vision come to pass.'
And when again they asked him, having burst into tears, he said, 'Wrath is about to seize the Church, and it is on the point of being given up to men who are like senseless beasts. For I saw the table of the Lord's House, and mules standing around it on all sides in a ring, and kicking the things therein, just like a herd kicks when it leaps in confusion. And you saw,' said he, 'how I groaned, for I heard a voice saying, “My altar shall be defiled.”' These things the old man saw, and after two years the present inroad of the Arians and the plunder of the churches took place, when they violently carried off the vessels, and made the heathen carry them; and when they forced the heathen from the prisons to join in their services, and in their presence did upon the Table as they would.
Then we all understood that these kicks of the mules signified to Antony what the Arians, senselessly like beasts, are now doing. But when he saw this vision, he comforted those with him, saying, 'Be not downcast, my children; for as the Lord has been angry, so again will He heal us, and the Church shall soon again receive her own order, and shall shine forth as she is wont. And you shall behold the persecuted restored, and wickedness again withdrawn to its own hiding-place, and pious faith speaking boldly in every place with all freedom. Only defile not yourselves with the Arians, for their teaching is not that of the Apostles, but that of demons and their father the devil; yea, rather, it is barren and senseless, and without light understanding, like the senselessness of these mules.'
Source: Vita S. Antoni (Life of St. Anthony) (New Advent)