She felt eternal gratitude to him for saving her life.

她永久感激他的救命之恩！

If you reserve judgement and spend time making that person comfortable you will not only spread some good karma around but will earn their eternal gratitude.

如果你保留意见，花些时间让别人觉得自在，你不仅会和他们有一段愉快时光，而且会得到他们永恒的感激。