I'm selfish: my thanks soothes me as much as it honors your kindness—what would my family say if they knew?

“Mr. Darcy, I am a very selfish creature, and for the sake of giving relief to my own feelings care not how much I may be wounding yours. I can no longer help thanking you for your unexampled kindness to my poor sister. Ever since I have known it I have been most anxious to acknowledge to you how gratefully I feel it. Were it known to the rest of my family I should not have merely my own gratitude to express.”