But now what has to be the case if we are going to posit a “cause” of the universe? That “cause” could not be in time and space, because then it would be as much a part of the universe as you and I are, and could not then cause it to be. So whatever “cause” of the universe there is would have to transcend the universe itself, including time and space.
So if there is a cause to the universe, it cannot be bound by time or space. It must, in that case, be both eternal and infinite.