Chapter 2, Part 6A - Lieh Tzu

Chao Hsiang Tzu led out a company of a hundred thousand men to hunt in the Central Mountains. Lighting the dry undergrowth, they set fire to the whole forest, and the glow of the flames was visible for a hundred miles around. Suddenly a man appeared, emerging from a rocky cliff,and was seen to hover in the air amidst the flames and the smoke. Everybody took him for a disembodied spirit. When the fire had passed, he walked quietly out, and showed no trace of having been through the ordeal.

Hsiang Tzu marvelled thereat, and detained him for the purpose of careful examination. In bodily form he was undoubtedly a man, possessing the seven channels of sense, besides which his breathing and his voice also proclaimed him a man. So the prince inquired what secret power it was that enabled him to dwell in rock and to walk through fire. 'What do you mean by rock? replied the man; 'what do you mean by fire?

Hsiang Tzu said: 'What you just now came out of is rock; what you just how walked through is fire.' 'I know nothing of them,' replied the man.
~ Lionel Giles translation via Terebess Asia Online ~

Go here to read the introductory post to the chapters of the Book of Lieh Tzu.