Mansfield Park by Jane Austen Chapter 48 Page 30

Susan became the stationary niece, delighted to be so; and equally well adapted for it by a readiness of mind, and an inclination for usefulness, as Fanny had been by sweetness of temper, and strong feelings of gratitude. Susan could never be spared. First as a comfort to Fanny, then as an auxiliary, and last as her substitute, she was established at Mansfield, with every appearance of equal permanency. Her more fearless disposition and happier nerves made everything easy to her there. With quickness in understanding the tempers of those she had to deal with, and no natural timidity to restrain any consequent wishes, she was soon welcome and useful to all; and after Fanny's removal succeeded so naturally to her influence over the hourly comfort of her aunt, as gradually to become, perhaps, the most beloved of the two.