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Warrant is that, whatever it is, which makes the difference between knowledge and mere true belief. In "Warrant Entails Truth" (PPR, December 1995), I argued that it is impossible that a false belief be warranted. Sharon Ryan attacked the argument of that paper in her "Does Warrant Entail Truth?" (PPR, March 1996). In "More on Warrant's Entailing Truth" I present arguments for the claim that warrant entails truth that are, I think, significantly more compelling than the arguments of my original "Warrant Entails Truth." This paper responds to Ryan's objections, but it is not merely a reply to Ryan's article. It is, rather, a free-standing defense of warrant's entailing truth that is the product of discussion and argument for over two years with many philosophers, including Ryan, over the arguments contained in my original paper.

The paper reconstructs Plantinga’s understanding of knowledge as an alternative to the standard conception of knowledge. In the first phase, Plantinga’s work about warrant was taken as a contribution to the discussion about the possibility of a priori knowledge. With his conception of knowledge as warranted belief he wanted to show that also a posteriori belief can have a degree of warrant, and may be considered to be knowledge. The paper concludes that Plantinga points at an alternative to the standard conception of knowledge, but cannot show either that God exists or that the theistic belief is universally basic without lapsing again into one of those self-referential theories that he would in principle reject.

Warrant is what fills the gap between mere true belief and knowledge. But a problem arises. Is there just one condition that satisfies this description? Suppose there isn’t: can anything interesting be said about warrant after all? Call this the uniqueness problem. In this paper, I solve the problem. I examine one plausible argument that there is no one condition filling the gap between mere true belief and knowledge. I then motivate and formulate revisions of the standard analysis of warrant. Given these revisions, I argue that there is, after all, exactly one warrant condition.

In response to a collection of essays in Jonathan Kvanvig's (1996) Warrant in Contemporary Epistemology: Essays in Honor of Plantinga's Theory of Knowledge, Alvin Plantinga notices that certain Gettier-style examples undermine his (1993b) canonical account of epistemic warrant as delineated in Warrant and Proper Function. In hopes to clarify how his account survives Gettier's purchase, he (1996; 2000) argues that a belief has warrant sufficient for knowledge only when produced in a favorable cognitive mini-environment. In Warranted Christian Belief Plantinga (2000) specifies a condition required for a cognitive mini-environment's favorability. I argue that this condition falls prey to counterexample. Then I investigate a possible solution, which I reason fails as well.

Alvin Plantinga Warranted Christian Belief (New York NY: Oxford University Press, 2000). In the two previous volumes of his trilogy on ‘warrant’, Alvin Plantinga developed his general theory of warrant, defined as that characteristic enough of which terms a true belief into knowledge. A belief B has warrant if and only if: (1) it is produced by cognitive faculties functioning properly, (2) in a cognitive environment sufficiently similar to that for which the faculties were designed, (3) according to a design plan aimed at the production of true beliefs, when (4) there is a high statistical probability of such beliefs being true. Thus my belief that there is a table in front of me has warrant if in the first place, in producing it, my cognitive faculties were functioning properly, the way they were meant to function. Plantinga holds that just as our heart or liver may function properly or not, so may our cognitive faculties. And he also holds that if God made us, our faculties function properly if they function in the way God designed them to function; whereas if evolution (uncaused by God) made us, then our faculties function properly if they function in the way that (in some sense) evolution designed them to function.

Plantinga examines the nature of epistemic warrant; whatever it is that when added to true belief yields knowledge. This volume surveys current contributions to the debate and paves the way for his owm positive proposal in Warrant and Proper Function.

Let ‘warrant’ denote whatever precisely it is that makes the difference between knowledge and mere true belief. A current debate in epistemology asks whether warrant entails truth, i.e., whether (Infallibilism) S’s belief that p is warranted only if p is true. The arguments for infallibilism have come under considerable and, as of yet, unanswered objections. In this paper, I will defend infallibilism. In Part I, I advance a new argument for infallibilism; the basic outline is as follows. Suppose fallibilism is true. An implication of fallibilism is that the property that makes the difference between knowledge and mere belief (which I dub ‘warrant*’) is the conjunctive property being warranted and true . I show that this implication of fallibilism conflicts with an uncontroversial thesis we have learned from reflection on Gettier cases: that nonaccidental truth is a constituent of warrant*. It follows that infallibilism is true. In the second part of the paper, I present and criticize a new argument against infallibilism. The argument states that there are plausible cases where, intuitively, the only thing that is keeping a belief from counting as knowledge is the falsity of that belief. Furthermore, it is plausible that such a belief is warranted and false. So, the argument goes, infallibilism is false. I show that this argument fails.

Alvin Plantinga’s Warranted Christian Belief1 is the final book in his three-volume exploration of warrant, which he takes to be the property of propositional knowledge differentiating it from mere true belief. He employs the conception of warrant developed in his second volume, Warrant and Proper Function,2 in defending the intellectual respectability of Christian belief.

Nowadays the traditional quest for certainty seems not only futile but pointless. Resisting skepticism no longer seems to require meeting the Cartesian demand for an unshakable foundation for knowledge. True beliefs can be less than maximally justified and still be justified enough to qualify as knowledge, even though some beliefs that are justified to the same extent are false. Yet a few philosophers suggest that there is a special sort of justification that only true beliefs can have. Call it 'full justification' or simply 'warrant.' One such philosopher is Trenton Merricks. He takes warrant to be "that, whatever precisely it is, which together with truth makes the difference between knowledge and mere true belief," and argues that only true beliefs can have it.1 In his view, then, warrant makes the difference between knowledge and mere belief. Interestingly, Merricks does not concern himself with the nature of this remarkable property. He prefers a "formal characterization" of warrant as the "gap filler" between knowledge and mere true belief. Whatever warrant is exactly, a warranted belief cannot be true accidentally, for then the belief would not qualify as knowledge.

In this companion volume to Warrant: The Current Debate, Plantinga develops an original approach to the question of epistemic warrant; that is what turns true belief into knowledge. He argues that what is crucial to warrant is the proper functioning of one's cognitive faculties in the right kind of cognitive environment.