"One misty rainy day, led by Rinpoche, we rode higher up into the mountains to Lake Tsingynu (The Turquoise Lake of the Collection of Tears from the Lion). Jamyang Khyentse Wangpo and Chogyur Lingpa discovered many terma at Lake Tsingynu. On one occasion Chogyur Lingpa tied his robe to the end of a long rope and threw it into the lake; when he pulled it out there was nothing in it. Rinpoche told us, ...."He then appeared to become a little crazy and walked on the water to the middle of the lake, dropped his robe into the water again and, when he withdrew the robe, it contained treasure teachings."
One of the many terma discovered at that time was Wisdom Light."
told by Dzongsar Khyentse Rinpoche