Abstract

A lengthy argument for the existence of a being possessing most of the attributes ascribed to God in traditional philosophical theology is set forth by John Duns Scotus in the final two chapters of his Tractatus De Primo Principio.1 In 3.1-19, Scotus tries to establish the core of his proof, viz., that "an absolutely first effective is actually existent." It is an ingenious blend of elements that figure in standard versions of the cosmological and ontological arguments. However, while the reader of De Primo is apt to be deeply intrigued by the suggestiveness and originality of Scotus' discussion, attempting to organize and interpret the various threads of argument is a challenging task. This no doubt partially explains the relative neglect of Scotus' argument in contemporary discussion of theistic proofs. In what follows, I offer a reading of the argument as well as my critical assessment of it. I will contend that Scotus is unable to achieve all that he wants, in that a critical aspect of his official version of the argument is centrally flawed. However, the text also seems to suggest a modified version of the proof which relies on intuitive support for a possibility claim. I maintain that this form of the proof is sound. Furthermore, owing to the comparative weakness of its underived premises, Scotus' proof can be seen to offer a novel and appealing alternative to the more widely advertised versions of the cosmological and ontological arguments. If I am right, then, Scotus' De Primo has an important contribution to make to the contemporary discussion of an issue of perennial philosophical concern.