"And remember this," he continued, "that if you've been hated you've also been loved. Ah but, Isabel – adored!" he just audibly and lingeringly breathed. "Oh my brother!" she cried with a movement of still deeper prostration. (54.20)
Ralph’s final admonition to his beloved cousin is simply to remember that she has been loved deeply, not just by him, but by others. Hopefully, this will help Isabel pull herself out of her miserable and hate-filled marriage with Osmond.