Cryptogram from Pride and Prejudice, chapter 50

She had no fear of its spreading farther, through his means. There were few people on whose secrecy she would have more confidently depended; but at the same time there was no one whose knowledge of a sister's frailty would have mortified her so much. Not, however, from any fear of disadvantage from it individually to herself; for at any rate there seemed a gulf impassable between them. Had Lydia's marriage been concluded on the most honourable terms, it was not to be supposed that Mr. Darcy would connect himself with a family, where to every other objection would now be added an alliance and relationship of the nearest kind with the man whom he so justly scorned.

The sentence you are solving goes here.

What a triumph for him, as she often thought, could he know that the proposals which she had proudly spurned only four months ago would now have been gladly and gratefully received! He was as generous, she doubted not, as the most generous of his sex. But while he was mortal, there must be a triumph.