In the beginning
Consider a few examples. In Turok's universe there was no Big Bang and god's time runs through Brahmian cycles. Other people think the world was created only a few thousand years ago. Most physicists believe it sprung magically into being, spacetime and all, about 13 billion years ago, Earth time.
Einstein knew that all of these ideas were physically wrong. In a quantum universe, the passage of time and the meaning of mass are things that we measure. For example, when we look at an electron we find that its mass = 0.5109989 MeV. Now why is that?