Alvin Plantinga

I took it that the definitions Swinburne quotes imply that all of a person's basic beliefs are rational; Swinburne demurs. It still seems to me that these definitions have this consequence. Let me briefly explain why. According to Swinburne, a person's evidence consists of his basic beliefs, weighted by his confidence in them. So presumably we are to think of S's evidence as the set of the beliefs he takes in the basic way, together with a sort of index indicating, for each of those beliefs, his degree of confidence in that belief. Now it is clear, first, that different basic beliefs can be held with different degrees of confidence. I believe 2+1 = 3 more firmly than there are presently some large trees in my backyard, and I believe that second proposition more firmly than I played bridge last night. Nevertheless, I believe all three propositions; I don't just believe them probably. So, the set of my basic beliefs contains propositions, all of which I believe. Further, a belief of mine is ‘rendered probable by [my] evidence’, I take it, just if it is probable with respect to the set of my basic beliefs. But of course probability of 1 with respect to that set; the degree of confidence with which I hold those beliefs does not seem to be relevant. Hence my conclusion that on these definitions all of my basic beliefs are rational. Swinburne points out that some of my basic beliefs may be improbable with respect to the rest of my basic beliefs; these beliefs, then, might be thought irrational, at least if they are not held as firmly as those with respect to which they are improbable. But this seems to me an uninteresting sense of ‘irrational’. Many of my basic beliefs are improbable with respect to my other basic beliefs; they are none the worse for that. I now remember, as it seems to me, that in the second bridge hand last night I was dealt three aces, three jacks, and three deuces. This is unlikely on the rest of my basic beliefs. It is, nonetheless, not irrational in any useful sense; memory is an important and independent source of rational belief, a source such that its deliverances do not necessarily depend, for warrant or rationality, on their probability with respect to other basic beliefs. I believe the same goes for some of my Christian beliefs. They may be improbable with respect to other beliefs, basic or otherwise, that I hold; but that need be nothing whatever against them. Footnotes1 Note: This brief discussion arises out of Richard Swinburne's critical notice of Alvin Plantinga 's Warranted Christian Belief and Plantinga 's reply in Religious Studies, 37, 203–214, 215–222

Take naturalism to be the idea that there is no such person as God or anything like God. Many philosophers hold that naturalism can accommodate serious moral realism. Many philosophers (and many of the same philosophers) also believe that moral properties supervene on non-moral properties, and even on naturalistic properties (where a naturalistic property is one such that its exemplification is compatible with naturalism). I agree that they do thus supervene, and argue that this makes trouble for anyone hoping to argue that naturalism can accommodate morality.

Can belief in God be rationally justified? Reviewing in detail traditional and modern arguments for and against the existence of God, Professor Plantinga concludes that they must all be judged unsuccessful. He then turns to the related philosophical problem of the existence of other minds, and defends the so-called analogical argument against current criticisms. He goes on to show, however, that although this argument affords us the best reasons we have for belief in other minds, it finally succumbs to the same malady that afflicts the teleological argument of God.

How does Christianity bear on philosophy? Is there such a thing as Christian philosophy, or are there only Christians who are also philosophers? How should Christianity and philosophy be related? Should they be related? In “Advice to Christian Philosophers” I said that Christian philosophers should display more autonomy: they have their own fish to fry, their own projects to pursue,. Here I want to say more about what these projects are like. And the right way to think about these matters, so it seems to me, is broadly Augustinian. Accordingly, I want to propose a programmatic sketch of a conception of Christian philosophy that grows out of some central Augustinian emphases. I don’t claim, however, that Augustine in fact thought of Christian philosophy the way I shall suggest. The primary focus of my paper is not historical ; what I want to do is make a suggestion as to how we should think about Christian philosophy now; but this way of thinking of the matter grows out of Augustinian roots. It’s worth noting, furthermore, that what is at issue is not just a way of thinking about Christianity and philosophy, but about Christianity and scholarship more generally.

The question is: how should a theist think of justification or positive epistemic status? The answer I suggest is: a belief B has positive epistemic status for S only if S’s faculties are functioning properly (i.e., functioning in the way God intended them to) in producing B, and only if S’s cognitive environment is sufficiently similar to the one for which her faculties are designed; and under those conditions the more firmly S is inclined to accept B, the more positive epistemic status it has for her. I conclude by making some qualifications and applications and exmaining some objections.