Today is the feast of Basil the Great (330-379) and his friend, Gregory Nazianzus (329-390), known as ‘the Theologian’. Together with Basil’s brother Gregory of Nyssa, they are remembered as the Cappadocian Fathers. Basil was one of ten children born into a wealthy Christian family whose commitment to their faith had been tested by persecution: a maternal grandfather had suffered martyrdom, while their paternal grandparents had their property confiscated and fled to the forested mountains of Pontus where they lived for seven years by hunting and fishing. Basil and Gregory Nazianzus met as students in Athens and remained lifelong friends. They had contrasting temperaments. Basil was the extravert man of action, an able leader, administrator and ecclesiastical politician whose preferred form of religious life was communal, while Gregory was a sensitive introvert, poet and man of letters who disliked publicity and loved solitude. Both were major players in the development and consolidation of Trinitarian doctrine and the victory of Nicene orthodoxy, which affirmed the divinity of the Son, over Arianism, which denied it. It is to Gregory that we owe the maxim, ‘What has not been assumed, has not been redeemed’ (Letter 101).