Abstract

In his critic of the doctrine of Bardaisan, Ephrem the Syrian devotes a lot of space to reflection on the meaning of the terms ītutā and ītyā which, as he denounces, are used inaccurately by his opponent. These Syriac terms can be translated by “being” or “essence”, but also by “substance”. This observation leads us to propose the comparison with the Greek term οὐσία, taking into account many difficulties raised by its uses in theological discourse. The article is devoted to the analysis of the uses of the terms ītutā and ītyā ‑ by Ephrem and by Bardaisan ‑ in their different ways of describing the divine essence. This comparison reveals the peculiarities of the two systems of thought and also their connections with the Greek philosophical doctrines.