…happy to assist in the duties of the day, by spending it at the Park to support her sister’s spirits, and drinking the health of Mr. and Mrs. Rushworth in a supernumerary glass or two, was all joyous delight; for she had made the match; she had done everything; and no one would have supposed, from her confident triumph, that she had ever heard of conjugal infelicity in her life, or could have the smallest insight into the disposition of the niece who had been brought up under her eye.
There are no more uses of "insight" in the book.
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The book is full of insight on human nature.
The study offers further insight into the Palestinian situation.