Having never even fancied herself in love before, her regard had all the warmth of first attachment, and, from her age and disposition, greater steadiness than most first attachments often boast; and so fervently did she value his remembrance, and prefer him to every other man, that all her good sense, and all her attention to the feelings of her friends, were requisite to check the indulgence of those regrets which must have been injurious to her own health and their tranquillity.
There are no more uses of "requisite" in the book.
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a place where the requisites of water, food, and shelter can be obtained
To disagree with three-fourths of the British public is one of the first requisites of sanity.