The grounding principle seems to have quite substantive ontological implications. Take the true claim that there once were dinosaurs. What object could be such that its existence grounds the truth of that claim? Perhaps any of the formerly alive dinosaurs. But you might have thought there aren’t any such things – after all, isn’t that what we mean by saying that dinosaurs are extinct? That there don’t exist any dinosaurs? So the grounding principle pushes you toward accepting past objects in your ontology: your dead great-great-grandparents, Caesar and Cleopatra, the dinosaurs and what not, all exist, all as real as you and me – only they’re somewhat different from you and me in that they’re past.
Continuing the End Times series, Richard Marshall interviews Stephan Kraemer.