John 11:21 Meaning

19And many of the Jews came to Martha and Mary, to comfort them concerning their brother.

20Then Martha, as soon as she heard that Jesus was coming, went and met him: but Mary sat still in the house.

21Then said Martha unto Jesus, Lord, if thou hadst been here, my brother had not died.

22But I know, that even now, whatsoever thou wilt ask of God, God will give it thee.

23Jesus saith unto her, Thy brother shall rise again.