Stacy has never told anyone what House said when he was dying; she doesn't think he remembers, she doesn't think anyone else heard.

She doesn't know he voiced the sentiment twice, using different words for different people, but with the same look upon his face, the same weighted meaning sitting uncomfortably behind his eyes, like it wasn't used to being known.

Wilson's never told anyone what House said when he was dying; he knows House remembers, but he's content with the dying moment. It has sanctity. He is preserving it, keeping the desperate pits of House's soul from being tarnished.