In a flat universe the total energy of the universe is precisely zero. Because gravity can have negative energy so the negative energy of gravity balances out the positive energy of matter. What's so beautiful about a universe with a total energy of zero? Only such a universe can begin from nothing. . . the laws of physics allow the universe to begin from nothing. You don't need a deity. You have nothing, zero total energy, and quantum fluctuations can produce a universe.
--Lawrence Krauss (A Universe From Nothing)
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