Medieval theology, in all its diversity, was radically theo-centric, Trinitarian, Scriptural and sacramental. It also operated with a profound view of human understanding (in terms of intellectus rather than mere ratio). In a post-modern climate, in which the modern views on `autonomous reason` are increasingly being questioned, it may prove fruitful to re-engage with pre-modern thinkers who, obviously, did not share our modern and post-modern presuppositions. Their different perspective does not antiquate their thought, as some of the `cultured despisers` of medieval thought might imagine. On the contrary, rather than rendering their views obsolete it makes them profoundly challenging and enriching for theology today. This book is more than a survey of key medieval thinkers (from Augustine to the late-medieval period); it is an invitation to think along with major theologians and explore how their thought can deeply challenge some of today`s modern and post-modern key assumptions.