This chapter further explores the Cambridge Platonists’ religious epistemology by examining their theory of spiritual sensation, a striking fusion of early modern sense theory, early Christian notions of deification, Puritan spirituality, and Platonic metaphysics. The Cambridge Platonists hold that when a soul becomes deified through the practice of virtue, God comes to dwell in it, and that as a result, the soul becomes able to know God directly by looking inward. This knowledge is the fruit of direct, perceptual contact with God, granting it a phenomenal quality that cannot be attained by mere descriptions of God. Conversely though, when a soul marred with vices looks inward in the attempt to know God, it inevitably forms a distorted picture of God that reflects its own moral flaws. Thus, the Cambridge Platonists’ theory of spiritual sensation undergirds their rejection of Calvinist doctrine, providing them with a sort of ‘error theory’ to explain how their theological opponents arrived at the views they did.

The Cambridge Platonists’ anti-Calvinism was undergirded by a Platonic epistemology of participation – an epistemology on which the faculty of reason allowed the soul to participate in, and thereby come to know, the nature of God. This epistemology, drawn largely from Plotinus, enabled them to defend and articulate their reasons for rejecting the arbitrary, voluntarist picture of God propagated by their Calvinist contemporaries, and defend their own, rival conception of God as unswervingly committed to communicating his overflowing goodness to all his creatures. The central component of this Platonic epistemology is a high view of human reason as a direct participation in the divine nature, where beauty, goodness and truth are inseparably united. This chapter introduces the Cambridge Platonists’ religious epistemology by highlighting the ways in which they make conformity to God, both through purity of mind and virtuous action, a precondition for knowledge of God, resulting in a distinctive combination of Plotinian epistemology and Puritan spirituality.