Vita S. Antoni (Life of St. Anthony)

⁶⁶ And he had also this favour granted him. For as he was sitting alone on the mountain, if ever he was in perplexity in his meditations, this was revealed to him by Providence in prayer. And the happy man, as it is written, was taught of God. After this, when he once had a discussion with certain men who had come to him concerning the state of the soul and of what nature its place will be after this life, the following night one from above called him, saying, 'Antony, rise, go out and look.'

Having gone out therefore (for he knew whom he ought to obey) looking up, he beheld one standing and reaching to the clouds, tall, hideous, and fearful, and others ascending as though they were winged. And the figure stretched forth his hands, and some of those who were ascending were stayed by him, while others flew above, and having escaped heaven-ward, were borne aloft free from care. At such, therefore, the giant gnashed his teeth, but rejoiced over those who fell back. And immediately a voice came to Antony, 'Do you understand what you see?'

And his understanding was opened, and he understood that it was the passing of souls, and that the tall being who stood was the enemy who envies the faithful. And those whom he caught and stopped from passing through are accountable to him, while those whom he was unable to hold as they passed upwards had not been subservient to him. So having seen this, and as it were being reminded, he struggled the more daily to advance towards those things which were before. And these visions he was unwilling to tell, but as he spent much time in prayer, and was amazed, when those who were with him pressed him with questions and forced him, he was compelled to speak, as a father who cannot withhold ought from his children.

And he thought that as his conscience was clear, the account would be beneficial for them, that they might learn that discipline bore good fruit, and that visions were oftentimes the solace of their labours.