In the end the old woman shook her head, and told her that this was a rare and incurable disease, and that she was going blind. Oh, God, the wife then cried, that the ship was back in harbor of Elsinore. Then I should have the glass taken out from her, and the jewels put back. For did he not say that they were my eyes?

위 문장에서 제가 밑줄친that이 없어도 문장이 성립하는것같은데, that이 어떤 문법적인 이유로 나온건지 궁금합니다.

두번째는 뒷 문장에 밑줄 친 for는 어떤 문법적 이유로 사용된거고 , 오떻게 해석해야 하는지 궁금합니다.