Desert Fathers, on Heb 12:29

“For our God is a consuming fire.”

“Lot went to Joseph and said, 'Abba, as far as I can, I keep a moderate rule, with a little fasting, and prayer, and meditation, and quiet: and as far as I can I try to cleanse my heart of evil thoughts. What else should I do?' Then the hermit stood up and spread out his hands to heaven, and his fingers shone like ten flames of fire, and he said, 'If you will, you can become all flame.'”

Imported from an open dataset — not yet checked against the printed edition.