In an interesting new book, Our Mathematical Universe, physicist Max Tegmark suggests that ultimately we and our universe are simply parts of eternal mathematical structures.  What is an eternal mathematical structure?  According to Tegmark, it is the ground of what is real; everything comes from them, everything happens in them.  They have always existed, in fact, they always will exist in this universe (unless this universe slides into a parallel universe, of which Tegmark believes at least four exist, and they become different structures).
     Curiously, Tegmark insists that although we can assert the fact of these structures, we cannot describe or fully understand them.  We know, believe, and affirm they are there, but we cannot begin to really grasp what they ultimately are.  It is beyond our current capabilities.
     After reading this book and finding great intrigue in how Tegmark builds his case, as he posits the ideas that "everything that can happen happens somewhere;" that there is an physical reality independent of the human mind; and that the theory of multiverses (multiple universes) solves the problem of infinite regress by presenting an infinite number of possibilities for what can be; and other fascinating thoughts, I came away thinking that he had simply solved one problem by raising another.  This has to do with what I will call the necessity of eternality.  Eternality is insuperably difficult to grasp, be it of God, mathematical structures, or otherwise, yet an eternal "somethingness" remains our only option for explaining how anything came to be.  Though Lawrence Krauss in his Universe from Nothing, asserts that something indeed "came out of nothing," we still cannot explain why there was even "nothing."  One way or the other, we need an eternal or endless starting point.
     And then we have the same question:  how did this get here?  There is either an endless personal or an eternal impersonal.  What to do?  Look at yourself, look at the world, and decide:  which eternality best explains how incredibly--and unbearably--orderly, complex, and complicated you, the world, and the universe, are?