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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.

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.

Alvin Plantinga theorizes about an epistemic property he calls "warrant," defined as that which makes the difference "between knowledge and mere true belief." I show that, given this account, Plantinga can have no justification for claiming that a false belief is warranted nor for claiming that warrant comes in degrees.

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.

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.

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.

This paper advances the debate over the question whether false beliefs may nevertheless have warrant, the property that yields knowledge when conjoined with true belief. The paper’s first main part—which spans Sections 2–4—assesses the best argument for Warrant Infallibilism, the view that only true beliefs can have warrant. I show that this argument’s key premise conflicts with an extremely plausible claim about warrant. Sections 5–6 constitute the paper’s second main part. Section 5 presents an overlooked puzzle about warrant, and uses that puzzle to generate a new argument for Warrant Fallibilism, the view that false beliefs can have warrant. Section 6 evaluates this pro-Fallibilism argument, finding ultimately that it defeats itself in a surprising way. I conclude that neither Infallibilism nor Fallibilism should now constrain theorizing about warrant.

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.

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.

Trenton Merricks argues that on any reasonable account, warrant must entailtruth. I demonstrate three theses about the properties ofwarrant: (1) Warrant is not unique;there are many properties that satisfy the definition of warrant. (2) Warrant need not entail truth; there are some warrant properties that entailtruthand others that do not. (3) Warrant need not be closed under entailment, even if knowledge is. If knowledge satisfies closure, then some warrant properties satisfy closure while others do not;if knowledge violates closure, then allwarrant properties violate closure.