How Should I Be A Sceptic -- in question of infinite regression
[Introductory note from Jason Pratt: the previous entry in this series of posts can be found here. The first entry can be found here. ] [Note: the previous entry ended with the questions, "So why can there not be grounds stretching on forever with no end, no Final Fact? Why can there not be an infinite regression?"] For what it is worth, I don't think it is possible to prove that an infinite regress does not exist--nor that it does exist. So I will presume each of these two mutually exclusive options; and then check to see if either or both of the options crash. Let me presume, for purposes of argument, that an infinite regress is real. What advantages does a proposed system of thought have, when based on this presumption? None! If an infinite regress is true, then we have no means of reaching valid conclusions. This is because we habitually presume, when we offer explanations or arguments, that somewhere 'behind' or 'under' the explanation (metaphorical