Faber, from the book Fahrenheit 451, believed that the solutions to the world's problems could all be found in books. The basis of Ray Bradbury's novel is to imagine a society where free and independent thought is frowned upon, and even punished. One of the ways in which this is manifested is by making books illegal. In Bradbury's society, the firemen do not put out fires, but instead they START fires, raiding homes where books are being secretly housed and setting fire to the books, symbolically showing how free thinking is also discouraged.
Faber believes that the problems in the world started after books were banned, so books must have all the answers. Since Faber himself is a fireman, he has been a first-hand witness to people losing most of their possessions, and in one instance, a woman's life, simply for the sake of hiding books. He realizes there must be something to this.