A helpful insight over at The Sola Panel:
Why was that phrase “The Bible doesn’t say” so comforting? Perhaps it’s because of what it implies. Non-Christian friends of ours, when faced with theological questions about God, heaven and hell, seem to feel a panicked sense of being out of their depth, and tend to make up whatever answer seems best to them, or whatever will make their kids feel better and stop all those difficult questions.
But when we say to our kids “The Bible doesn’t say”, there is actually an underlying subtext: “Mum and Dad don’t know everything, but that’s okay. God has it under control. Trust him. We don’t have to make it up. Anything that God wants us to know, he’s told us in the Bible.