posteriori and analytic/synthetic distinctions. Albert Casullo suggests in A Priori Justification, current opinion is deeply divided and radically polarized. To a large extent, one¿s views about the a priori determine how one goes about answering questions of metaphysics and epistemology. The work of Immanuel Kant and David Hume will be assessed using the metaphysics and theory of perception of Thomas Aquinas. It will be argued the disparity between the a priori and a posteriori and between analytic and synthetic propositions was introduced by a disconnect between intelligibility and sensibility in early modern philosophy, and can be resolved using a reformulation of the synthetic a priori by which causality and necessity can be known. Using the synthetic a priori one can argue to God¿s existence from efficient causality and modal necessity. The book is written to any concerned with noetics and metaphysics, philosophy of mind, early modern philosophy, Kant, Hume, Aquinas and Medieval theories of perception, the a priori and natural theology.

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