No one is able to put out the great fire of the Buddha's wisdom

"In the breast of the Buddha is a great fire, made up of the great wisdom of equality, the shining light of great knowledge, and the fire pit of meditation. When the Buddha enters nirvana, this great fire blazes forth from his breast and consumes his body. Though the heavenly deities and the dragons and other beings of the six heavens of the world of desire and the four seas, distressed at the thought of losing the Buddha, gather round and cause torrential rains to fall, until the earth of the entire major world system is under water and Mount Sumeru is about to be washed away, still they cannot put out this huge fire." - Letter to Horen