Revising the Relationship between a Priori Knowledge and Necessity

A priori knowledge has many definitions in western philosophy; the most well known one is the independence of proposition’s justification from sensory experience. Experience in the above definition should necessarily refer to sensory experience, otherwise, the distinction disappears and there remains no application for a priori statement. Necessity, in this article, means Vojoob which is considered as one of the three elements of a logical proposition. It seems that although Plantinga’s separation between objective and propositional necessity is conceptually acceptable it lacks application. For the author of the present paper, there is an essential relationship between a priori knowledge and necessity, i.e. all of a priori knowledge is essentially necessary. But this claim that a posteriori proposition cannot imply necessity and that necessary knowledge is unique to a priori proposition is a false claim, although if we take necessity as modality, it will have correlation with a priori knowledge.