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I argue that you can have a priori knowledge of propositions that neither are nor appear necessarily true. You can know a priori contingent propositions that you recognize as such. This overturns a standard view in contemporary epistemology and the traditional view of the a priori, which restrict a priori knowledge to necessary truths, or at least to truths that appear necessary.

The book sets out to analyse the notion of a priori justification and of a priori knowledge.

The existence and nature of the a priori are defining issues for philosophy. A philosopher’s attitude to the a priori is a touchstone for his whole approach to the subject. Sometimes, as in Kant’s critical philosophy, or in Quine’s epistemology, a major new position emerges from reflection on questions that explicitly involve the notions of the a priori or the empirical. But even when no explicit use is made of the notion of the a priori in the questions addressed, a philosopher’s methodology, the range of considerations to which the philosopher is open, his conception of the goals of the subject, his idea of what is involved in justification—all of these cannot fail to involve commitments about the nature and the existence of the a priori. So understanding the a priori is not only of interest in itself. It is also essential for self-understanding, if we are to understand ourselves as philosophers.

Being and Time, Heidegger praises Kant as “the first and only person who has gone any stretch of the way towards investigating the dimension of temporality or has even let himself be drawn hither by the coercion of the phenomena themselves” (SZ: 23).1 Kant was, before Husserl (and perhaps, in Heidegger's mind, more than him), a true phenomenologist in the sense that the need to curtail the pretension of dogmatic metaphysics to overstep the boundaries of sensible experience led him to focus on phenomena and the conditions of their disclosure: thus, the “question of the inner possibility of such knowledge of the super-sensible , however, is presented as thrown back upon the more general question of the inner possibility of a general making-manifest(Offenbarmachen) of beings (Seiende) as such” (GA 3: 10, emphasis supplied). So Kant shouldn’t be read as an epistemologist (contrary to Descartes, for example), but as an ontologist2: “Kant's inquiry is concerned with what determines nature as such -- occurrent beings as such -- and with how this ontological determinability is possible” (GA 25: 75). Heidegger sees this investigation into the “ontological determinability” of entities as an a priori form of inquiry: “what is already opened up and projected in advance ie the horizon of ontological determinability . . . is what in a certain sense is “earlier” than a being and is called a priori” (GA 25: 37). This a priori character of ontological determinability forms the main link between Kant's critical project and fundamental ontology, itself characterised as a form of transcendental philosophy: “transcendental knowledge is a knowledge which investigates the possibility of an understanding of being, a pre-ontological understanding of being. And such an investigation is the task of ontology. Transcendental knowledge is ontological knowledge, i.e. a priori knowledge of the ontological constitution of beings” (GA 25: 186). Thus Heidegger presents his own inquiry into the nature of Being as a way to address the same issue as Kant: “what is asked about is Being -- that which determines entities as entities, that on the basis of which entities are already understood, however we may discuss them in detail..

Infallibilism about a priori justification is the thesis that for an agent A to be a priori justified in believing p, that which justifies A's belief that p must guarantee the truth of p. No analogous thesis is thought to obtain for empirically justified beliefs. The aim of this article is to argue that infallibilism about the a priori is an untenable philosophical position and to provide theoretical understanding why we not only can be, but rather must be, a priori justified in believing some false propositions. The argument develops notions of obviousness and conceptual understanding as a means of affording insight into the conditions for having a priori justification and, consequently, into why infallibilism cannot stand.

Infallibilism about a priori justification is the thesis that for an agent A to be a priori justified in believing p, that which justifies A's belief that p must guarantee the truth of p. No analogous thesis is thought to obtain for empirically justified beliefs. The aim of this article is to argue that infallibilism about the a priori is an untenable philosophical position and to provide theoretical understanding why we not only can be, but rather must be, a priori justified in believing some false propositions. The argument develops notions of obviousness and conceptual understanding as a means of affording insight into the conditions for having a priori justification and, consequently, into why infallibilism cannot stand.

In this paper, it is argued that metaphysics, conceived as an inquiry into the ultimate nature of mind-independent reality, is a rationally indispensable intellectual discipline, with the a priori science of formal ontology at its heart. It is maintained that formal ontology, properly understood, is not a mere exercise in conceptual analysis, because its primary objective is a normative one, being nothing less than the attempt to grasp adequately the essences of things, both actual and possible, with a view to understanding as far as we can the fundamental structure of reality as a whole. Accordingly, it is urged, the deliverances of formal ontology have a modal and epistemic status akin to those of other a priori sciences, such as mathematics and logic, rather than constituting rivals to the claims of the empirical sciences, such as physics.

In this paper I will offer a novel understanding of a priori knowledge. My claim is that the sharp distinction that is usually made between a priori and a posteriori knowledge is groundless. It will be argued that a plausible understanding of a priori and a posteriori knowledge has to acknowledge that they are in a constant bootstrapping relationship. It is also crucial that we distinguish between a priori propositions that hold in the actual world and merely possible, non-actual a priori propositions, as we will see when considering cases like Euclidean geometry. Furthermore, contrary to what Kripke seems to suggest, a priori knowledge is intimately connected with metaphysical modality, indeed, grounded in it. The task of a priori reasoning, according to this account, is to delimit the space of metaphysically possible worlds in order for us to be able to determine what is actual.