The Man and the Snake

There is a poor man and a snake, they were good friends. The poor man visits the snake every day and the snake gives him 1 Lira.
The poor man's son learns about this and decides to kill the snake to get all the money. He goes to the snake's house and tries to kill it; but he can't. He only manages to cut off the tail of the snake. The snake turns round and bites him. The son dies.
A few months later, the poor man goes to the snake and suggests that they become friends again. The snake says:
"If you have grief for your son and I have grief for my tail we'll never be friends again."
ALAATTIN