Gregory of Nyssa

Gregory of Nyssa (c335 – c395) was Bishop of Nyssa in modern day Turkey. He was an important theologian in his day, and with Gregory Nazianzus and Basil of Caesarea, is one of the 'Cappadocian Fathers'.
Gregory of Nyssa writes on the unity of the Trinity and examines the divinity of the Holy Spirit. 
Gregory of Nyssa shows how the doctrine of the Trinity does not mean that Christians worship three gods. 
Gregory of Nyssa gives a brief exhortation on the Christian faith in the face of idolatry and heresy. 
Gregory of Nyssa writes against the Macedonians, who denied the divinity of the Holy Spirit.