I do see Gingerich's point about being silent about that whereof we cannot speak. The questions we are raising here might be what he calls "questions without answers," because they are questions about that of which we have no experience. Why is there something rather than nothing? is one such question. Since no human being has any experience with everything arising from nothing, it's not clear that the question is even comprehensible to us.
Christian, Brown, and Benjamin write: "What existed before our universe appeared remains unknown. We simply have no evidence, so we cannot say anything scientific about the moment when our universe appeared" (19).
And just as it's hard to say anything sensible about the beginning of time, it's hard to say anything about the end of time or the eternity outside of time.