Montag realized books were a wonderful method of opening up your life.
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Faber is Montag's mentor; he is learned and well read; he remembers what it was like before books went out of style. Montag needs Faber's intelligence and experience to bring down the fireman, and to initially understand "why" he needs to do so. Faber needs Montag because he is well schooled on the protocol and organization of his workplace. Together they are able to rebel in a way that keeps them both alive. The headset, for example, allows Faber to keep Montag grounded while his world starts falling apart.