"He who ceases to learn cannot adequately teach."

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Harry Potter (Daniel Radcliffe) is now fourteen, and, while he gives little sign of doing what Lord Rochester planned to do at the same age, there are nonetheless changes afoot. Harry's voice, like that of his best friend, Ron (Rupert Grint), sounds like the mating cry of an oboe, and, worse still, the two cease to be best friends.

— Anthony Lane