"Because of their size, parents may be difficult to discipline properly."

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But one type of book that practically no one likes to read is a book about the law. Books about the law are notorious for being very long, very dull, and very difficult to read. This is one reason many lawyers make heaps of money. The money is an incentive - the word "incentive" here means "an offered reward to persuade you to do something you don't want to do - to read long, dull, and difficult books.

— Daniel Handler