The first five chapters of the book examine the relation of creation to creator in terms of Aristotle's 'four causes' (or four aspects of causation): that God is the efficient, formal (or exemplar), and final cause of creation, but not the material cause. In this chapter, we consider further what it would mean to describe God as a cause, and relate the three of Aristotle's aspects of causation that can be applied analogically to God to the three Persons of the Trinity.The history of speaking in this way – of 'appropriating' divine acts or aspects of divine acts to Persons of the Trinity – is considered. Also discussed here are ways in which the language of participation has been used to talk about inter-Trinitarian relations.