The popular belief that religion is the same everywhere or that all religions are ‘at bottom’ identical in essentials is a widespread falsehood that is saved from being completely worthless by the fact that religion does exhibit a universal or common structure wherever it appears. This structure is intimately related to the structure of human life in the world. The enduring pattern that enables us to understand religions widely separated in both time and space depends largely on the fact that man and the process of human life in the world have their own structures which remain, despite the undeniable variety introduced by vast differences of culture, ethnic features, geographical location, climate etc. Structure means pattern or form; it is reality significantly organised. It can be grasped as that which endures above and beyond changing historical details. Because human life has a structure, we are able to understand the wrath of Achilles or sympathise with the love of Abélard for Héloïse although we are separated from both by centuries of time.