Elinor could hardly keep her countenance as she assented to the hardship of such an obligation.
They each felt his sorrows, and their own obligations, and Marianne, by general consent, was to be the reward of all.
—This was an obligation, however, which not only opposed her own inclination, but which had not the assistance of any encouragement from her companions.
It was an office in short, from which, unwilling to give Edward the pain of receiving an obligation from HER, she would have been very glad to be spared herself;— but Colonel Brandon, on motives of equal delicacy, declining it likewise, still seemed so desirous of its being given through her means, that she would not on any account make farther opposition.
So far was she, at the same time, from any backwardness to give Elinor that credit which Edward WOULD give her, that she spoke of her friendship for them both with the most grateful warmth, was ready to own all their obligation to her, and openly declared that no exertion for their good on Miss Dashwood’s part, either present or future, would ever surprise her, for she believed her capable of doing any thing in the world for those she really valued.
…something more than his affection for Marianne, or the consciousness of its being known to others; and she soon discovered in his melancholy eye and varying complexion as he looked at her sister, the probable recurrence of many past scenes of misery to his mind, brought back by that resemblance between Marianne and Eliza already acknowledged, and now strengthened by the hollow eye, the sickly skin, the posture of reclining weakness, and the warm acknowledgment of peculiar obligation.
There are no more uses of "obligation" in the book.