"Craig simply confesses that he does not have a good argument against those who claim that there are things other than God which do not have a cause of their existence. But if one can be reasonable in holding this opinion, then Craig is wrong: his argument is not entirely successful unless he provides compelling support for the causal premise. [...] there are people--myself included--who think that it might well be the case that there are non-abstract things other than God whose existence is uncaused, and who are not obviously irrational in this belief. No useful purpose is served by the insistence that such people are obviously mistaken: mere rhetoric is no substitute for argument." Graham Oppy, "Reply to Professor Craig" (1995)