Ryutan and Tokusan were talking late into the night. Finally Ryutan said, 'It's getting late. Why don't you retire?' Tokusan made his bows and lifted the screen to leave, but saw it was pitch dark outside. He turned and said, 'It's dark out there.' Ryutan lit a candle and handed it to Tokusan. As Tokusan reached for it, Ryutan blew it out. At that moment Tokusan was enlightened.

Mumonkan, Case 28