"Well, I’m not complaining," said Harry, who missed neither the disturbing dreams nor the startling flashes of insight into Voldemort’s mind.
It is Voldemort’s fault that you were able to see into his thoughts, his ambitions, that you even understand the snakelike language in which he gives orders, and yet, Harry, despite your privileged insight into Voldemort’s world (which, incidentally, is a gift any Death Eater would kill to have), you have never been se-duced by the Dark Arts, never, even for a second, shown the slight-est desire to become one of Voldemort’s followers!
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.