For christian ontology of the created, the originally stoic concept of diastema has key meaning. In an original and creative way, Origen introduces this concept into the christian thought. In the theological conflicts of the 4th century the idea of diastema plays an important role in the articulation of the anti-arian argumentation, especially in the work of St. Gregory of Nyssa. St. Gregory of Nyssa followed Origenes’ insights and worked out the concept of diastema by implementing it in a wide spectrum of problems, from triadology to epistemology and language theory. As St. Gregory of Nyssa uses the idea of diastema to determine the difference in the ways God and the creation exist, most scholars interpret the meaning of this term by recognizing in it the thing that determins the created by itself, which in the end results with diastema being understood as quality in which the creation is differentiated from the Creator. The speculation of the angelic diastema is built upon exactly on such an interpretation. This paper calls into question some very problematic aspects of such a, in many ways correct, interpretation of the views of St. Gregory.