The Secret Transmission of the Great Master of Tibet

There's a story of Millarapa, who was the great yogi of Tibet. And he had a chief disciple who was waiting to get the secret transmission. Not too long before he died, Millarapa thought, okay, this is the time. So they checked off, just the two of them, checked off up into the mountains to this very remote place. It's said that Millarapa just bent over, lifted his robe and showed the calluses on his butt. That's what it takes.