We live in an expanding material universe that began at the first moment of time. Before the beginning of this universe there was nothing, and after the end of the physical universe there will also be nothing. It is within this nothing that the physical universe is expanding in time and in space, which is to say, that its expansion creates time and space within the infinite nothingness out of which it emerged and into which it is expanding. This nothing is absolute, infinite and eternal, while the physical universe is relative, finite and temporal. Viewed from within the universe of relativity the absolute is nothing, it does not exist. Only the relative universe exists and it came into existence at its beginning out of nothing, out of the absolute, out of a true vacuum in which there is not even a presentiment of materiality.