Explain the following statement: It was a turning point in his career, but he did not know it.

Bilbo had found the ring. This was a find that anyone would dream of. It would change forever everything about his life.

His head was swimming, and he was far from certain even of the direction they had been going in when he had his fall. He guessed as well as he could, and crawled along for a good way, till suddenly his hand met what felt like a tiny ring of cold metal lying on the floor of the tunnel.