**“** Even if there is only one possible unified theory, it is just a set of rules and equations. What is it that breathes fire into the equations and makes a universe for them to describe? **”**

Stephen Hawking, *A Brief History of Time* (1988). copy citation

Author | Stephen Hawking |
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Source | A Brief History of Time |

Topic | theory universe equation |

Date | 1988 |

Language | English |

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Weblink | https://archive.org/stream/ABriefHistoryOfTimeByStephenHawking/A%20Brief... |