 There can be seen in his works influence from the Cappadocian Fathers, focusing the concept of Hypostasis (philosophy) to express the independent reality of the three persons of the Trinity rather than beginning with the one divine substance (ουσια) as his starting point.Within these three persons, the Father is the root of the Divinity, the Spirit proceeds from the Father, and the Son is generated.Didymus seemed very concerned with stressing the equality of the persons of the Trinity.