blog.kennypearce.net

Leibniz's Short Proof of Classical Theism

In a single paragraph near the beginning of the Theodicy, Leibniz gives a very compressed version of an argument a contingentia mundi (from the contingency of the world) from which he purports to derive not just the existence of God, but several of the most important traditional divine attributes (from which, Leibniz seems to think, the other divine attributes follow). In this post, I'll try to unpack Leibniz's reasoning. I'm not going to do too much evaluation of the arguments, since this post will be long enough without that; I'll just lay out the arguments as I see them and...
Continue reading "Leibniz's Short Proof of Classical Theism"

Explanatory Principles and Infinite Propositions

In the course of his discussion of cosmological arguments, Sobel argues against the Principle of Sufficient Reason and similar strong explanatory principles. In particular, he argues that even a weak principle like "there is a deductive explanation that has only true premises for every contingent truth" will result in modal collapse (p. 218). In Sobel's terminology, an argument 'deductively explains' its conclusion iff (1) the argument is sound, and (2) the conclusion does not entail the premises (p. 219; condition (2) applies to contingent conclusions only). Sobel now introduces the following two premises: (3) If there is any true contingent...
Continue reading "Explanatory Principles and Infinite Propositions"

A Non-Leibnizian Cosmological Argument

In my last Sobel post, I reconstructed the cosmological argument Sobel attributes to Leibniz in such a way that there was no obvious contradiction in the premises by using Leibniz's own resources. Here I want to try to produce an argument with more widely accepted premises. Recall that Sobel's reconstruction is as follows: (1)The World - the Cosmos - exists. (2) The World is contingent, it is a contingent entity. (3) For everything that exists - for every fact and every existent entity - there is a sufficient reason for its existence. (4) The sufficient reason for the existence of...
Continue reading "A Non-Leibnizian Cosmological Argument"

A Leibnizian Cosmological Argument

Sobel's sixth chapter is devoted to, as he says, "proofs a contingentia mundi" (from the contingency of the world). The chief exponent here is Leibniz, though Sobel also considers Hume's Demea and his probable source, Samuel Clarke. Sobel argues that Leibniz's argument is valid ... by contradiction explosion. That is, he argues that Leibniz's premises are inconsistent. In this post, I show how to fix the argument using Leibnizian resources. In the next post, I will give another version of the argument which uses premises which I consider to be anti-Leibnizian, but which I think are more widely held than...
Continue reading "A Leibnizian Cosmological Argument"

What is Supposed to be Proved in Aquinas's Five Ways?

I'm not a Medieval scholar, so I don't really know what I'm talking about, but that's ok. Sobel's fifth chapter is concerned with Aquinas's Second Way, one of the classic texts for the cosmological argument. Sobel raises some concerns about the premises, but for the most part he finds them plausible (though he may ultimately reject one or more of them). His main concern is that, as he schematizes the argument, a fallacy of equivocation occurs at the very end. Sobel reads the 'good' part of the argument as (perhaps) justifying the 'Preliminary Conclusion'...
Continue reading "What is Supposed to be Proved in Aquinas's Five Ways?"

Evaluating the Traditional Arguments for God

Kant famously classified traditional arguments for the existence of a divine being into three categories: ontological, cosmological, and teleological. Very few, if any, philosophers today think that any of these forms of argument is conclusive. However, some philosophers do believe that a cumulative case for the existence of a divine being can be made out from these arguments. Atheist colleagues often respond that "three leaky buckets won't hold water any better than one." However, this reply assumes that the traditional arguments don't show anything at all. Specifically, those who respond this way are often assuming that the arguments are straightforwardly...
Continue reading "Evaluating the Traditional Arguments for God"

What Caused God?

In comments to my post on Dawkins and the Philosophers, atheist blogger Jonathan West has been pushing back against Michael Ruse's claim that Dawkins' prominent use of the "what caused God?" question is, as Jonathan puts it, 'fatuous.' Jonathan has also pushed this point in a recent blog post which considers this question in light of Swinburne's 'necessary being' arguments in The Existence of God. I will first make a few remarks about Swinburne's work in this area, and then proceed to show why the "what caused God?" question is indeed confused. To be fair, I admit...
Continue reading "What Caused God?"