This is the story of a person who decided to study Judo despite the fact that he had lost his left arm in a devastating car accident.
He began lessons with an old Japanese Judo master. He was doing well, so he couldn't understand why, after three months of training the master had taught him only one move.
"Sensei," the boy finally said, "Shouldn't I be learning more moves?"
"This is the only move you know, but this is the only move you'll ever need to know," the Sensei replied.