Although Thomas Jackson (1579-1640) is recognized by scholars as the most important theologian of the Laudian church, hitherto there has been no comprehensive study of his philosophical theology. The reason for Jackson's neglect is that scholars have been puzzled by the sources, character and influence of his Christian Platonism. From a close and comprehensive reading of his magnum opus - a massive twelve book commentary on the Apostles' Creed - this book shows how Jackson regards the Platonic tradition as an essential and perennial resource for the Christian theologian, anticipating and informing central aspects of Christian theological speculation and belief, given by divine providence to help him interpret and defend his creed. Special attention is paid to the influence of Nicholas of Cusa (1401-1464) on Jackson, an important moment in the history of thought since the German cardinal is generally thought to have been without intellectual successors in the early modern period.