Late one night a blind man was about to go home after visiting a friend — "Please," he said to his friend, "May I take your lantern with me?"
"Why bother with a lantern?" — asked his friend — "You won't see any better with it."
"No," — said the blind man — "perhaps not. But others will see me better, and won’t bump into me.”
So his friend gave the blind man the lantern. It was made of paper and bamboo and held a fresh wax candle inside.
Off went the blind man with the lantern, and before he had gone no more than a few feet, Crack! Someone walked right into him.
The blind man was very angry.
"Why don't you look out?" — he stormed — "Can’t you see this lantern I’m carrying?!"
The stranger looked at the man for a moment — "Why don't you light the candle?"