Once, very early in my career, it had totally failed me; since then I had been obliged on more than one occasion to double, and once, with infinite risk of death, to treble the amount; and these rare uncertainties had cast hitherto the sole shadow on my contentment.
There are no more uses of "obliged" in the book.
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He obliged her by listening attentively.
They looked at me expectantly and I was obliged to comment.