Colin McGinn, philosopher at the University of Miami
As mentioned in my second post, Colin McGinn (echoing Immanuel Kant) makes a distinction between asking why some particular existent within the whole of existence exists, and why the whole of existence itself exists. The former question can be answered by appealing to some other preexistent existent within the whole of existence, but the latter question appeals to some existent outside the whole of existence to explain the whole of existence. It is impossible, however, for something to exist outside the set of the whole of existence. By definition there cannot be additional entities outside the set of “every existing thing.”
McGinn thinks this problem can be remedied by reformulating the question as “Is it true of every concrete thing that it exists contingently, or necessarily?” He affirms that every concrete entity exists contingently. So far so good, but why do concrete entities exist, then? Here is where McGinn fumbles. He affirms that the whole of concrete, contingent existence just exists inexplicably! Surely this is absurd. Contingent beings, by definition, derive their being from something outside themselves, and thus there must be an explanation for why they exist. It is metaphysically absurd to speak of an uncaused contingent being. Inexplicability is appropriate for a necessary being, but not contingent beings (and all concrete entities are contingent beings).
