In the final, deliberately experimental chapter, Bradatan compares Berkeley's denial of the existence of matter with medieval dualistic heresies, in particular Catharism, in the belief that the comparison affords a better understanding of immaterialism
Weissman's central claim--that the collapse of immaterialism
will have wide-ranging consequences we have not yet anticipated--is surely right and worthy of further consideration.
He was the author of a new theory of vision, of the celebrated 'new principle' of immaterialism
, of a 'new argument' to prove the existence of God, of a bold criticism of the infinitesimal calculus, of new proposals to improve the Irish economy, and of a novel panacea--tar-water --able to cure every disease in his diocese (where there were no doctors).
1721), and then proceeds to chart the development of his more mature views, showing in particular how the development of his immaterialism
during the early 1720s drove him to change his mind on the issue of space and its relationship with God.