Sometimes it is said that quantum physics furnishes an exception to premise (1) [Whatever begins to exist has a cause], since on the sub-atomic level events are said to be uncaused. In the same way, certain theories of cosmic origins are interpreted as showing that the whole universe could have sprung into being out of the sub-atomic vacuum or even out of nothingness. Thus the universe is said to be the proverbial “free lunch.” ¶ This objection, however, is based on misunderstandings. In the first place, not all scientists agree that sub-atomic events are uncaused. A great many physicists today are quite dissatisfied with this view (the so-called Copenhagen Interpretation) of quantum physics and are exploring deterministic theories like that of David Bohm. Thus, quantum physics is not a proven exception to premise (1). Second, even on the traditional, indeterministic interpretation, particles do not come into being out of nothing. They arise as spontaneous fluctuations of the energy contained in the sub-atomic vacuum, which constitutes an indeterministic cause of their origination. Third, the same point can be made about theories of the origin of the universe out of a primordial vacuum. Popular magazine articles touting such theories as getting “something from nothing” simply do not understand that the vacuum is not nothing but is a sea of fluctuating energy endowed with a rich structure and subject to physical laws. Such models do not therefore involve a true origination ex nihilo.

Premise (1) [Whatever begins to exist has a cause.] does not state merely a physical law like the law of gravity or the laws of thermodynamics, which are valid for things within the universe. Premise (1) is not a physical principle. Rather, premise (1) is a metaphysical principle: being cannot come from nonbeing; something cannot come into existence uncased from nothing. The principle therefore applies to all of reality, and it is thus metaphysically absurd that the universe should pop into being uncaused out of nothing. This response seem quite reasonable: for on the atheistic view, there was not even the potentiality of the universe’s existence prior to the big bang, since nothing is prior to the big bang. But then how can could the universe become actual if there was not even the potentiality of its existence?

To use a feeble analogy, it is rather like asserting that it is inadequate to say that light is the cause of illumination because one is then obliged to say what it is that illuminates the light, and so on ad infinitum. ¶ The most venerable metaphysical claims about God do not simply shift priority from one kind of thing (say, a teacup or the universe) to another thing that just happens to be much bigger and come much earlier (some discrete, very large gentleman who preexists teacups and universes alike). These claims start, rather, from the fairly elementary observation that nothing contingent, composite, finite, temporal, complex, and mutable can account for its own existence, and that even an infinite series of such things can never be the source or ground of its own being, but must depend on some source of actuality beyond itself. Thus, abstracting from the universal conditions of contingency, one very well may (and perhaps must) conclude that all things are sustained in being by an absolute plenitude of actuality, whose very essence is being as such: not a “supreme being,” not another thing within or alongside the universe, but the infinite act of being itself, the one eternal and transcendent source of all existence and knowledge, in which all finite being participates.

The existence of our universe might be explained by scientific cosmology, but such an explanation would still have to refer to features of some larger reality that contained or gave rise to it. A scientific explanation of the Big Bang would not be an explanation of why there was something rather than nothing, because it would have to refer to something from which that event arose. This something, or anything else cited in a further scientific explanation of it, would then have to be included in the universe whose existence we are looking for an explanation of when we ask why there is anything at all. This is a question that remains after all possible scientific questions have been answered.

It is said that an argument is what convinces reasonable men and a proof is what it takes to convince even an unreasonable man. With the proof now in place, cosmologists can no longer hide behind the possibility of a past-eternal universe. There is no escape: they have to face the problem of a cosmic beginning.

While the many-worlds interpretation has many adherents, and the associated mathematical formalism has great merit, other viable interpretations of quantum mechanics remain with no consensus on which, if any, is the correct one … In fact, the highly successful theory of quantum mechanics does not predict the occurrence of these events, just their probabilities for taking place. While we leave open the possibility that causes may someday be found for such phenomena that allow for their prediction, we have no current basis for assuming such causes exist.