The Father in the Son, the Son in the Father in the Gospel of John: Sources and Reception of Dynamic Unity in Middle and Neoplatonism, ‘Pagan’ and Christian
Authors: Ramelli Ilaria L.E. 
Published: July 2020

Abstract
This article will investigate the context – in terms of both sources (by means of influence, transformation, or contrast) and ancient reception – of the concept of the ‘dynamic unity’ of the Father in the Son and the Son in the Father (expressed in John 10:38, 14:10, and 17:21) in both ‘pagan’ and Christian Middle-Platonic and Neoplatonic thinkers. The Christians include Clement of Alexandria, Origen, and Gregory of Nyssa, as well as Evagrius Ponticus and John Scottus Eriugena. The article will outline, in so-called ‘Middle Platonism,’ the hierarchical theology of a first and second God (and sometimes a third), and in Neoplatonism Plotinus’ three hypostases arranged in hierarchical order, which will be contrasted with Origen’s and the Cappadocians’ three divine hypostases that are equal – like those of Augustine. Thus, for Origen not only is the Son in the Father, as in a ‘pagan’ Middle and Neoplatonic scheme, but also the Father is in the Son, in a perfect reciprocity of dynamic unity. Origen subscribes to this reciprocity because, as I argue, he is no real ‘subordinationist’, but the precursor of the Nicene and Constantinopolitan line (the Cappadocians, especially Nyssen, developed and emphasized the notion of equality, bringing the three Hypostases of the Trinity to the level of Plotinus’ One, but the premises were all in Origen’s theology and his concept of the coeternity of the three Hypostases and their common divinity: Nyssen, like Athanasius, even uses Origen’s arguments in his own anti-Arian polemic, as we shall see). Origen interpreted Philo’s theology, also close to so-called Middle Platonism, in a non-subordinationistic sense, attributing to the Hypostasis of Logos/Sophia the various dynameis, such as Logos and Sophia, that Philo used most probably in a non-hypostatic sense.
I shall also demonstrate how Gregory of Nyssa, significantly following Origen, in his work Against Eunomius used John 14:10a to refute the philosophical argument of Eunomius, who had a profoundly subordinationistic view of Christ with respect to the Father. Gregory’s solution is that neither the Father nor the Son are in an absolute sense, but both are in a reciprocal relation or σχέσις, what I shall present as Gregory’s own version of the ‘dynamic unity’ (in turn grounded in Origen). I shall also concentrate on the use that Gregory makes of John 17:21-23 to argue that the unity of the Father and the Son, and of all believers – and eventually all humans – in them, is substantiated by the Holy Spirit, who is seen as a bond of unity.
I shall study how the notion of the Father in the Son and the Son in the Father relates to the parallel statements in John 14:10, that Christ is in the disciples (and all believers) and these are in Christ – what I will call an ‘expansive’ notion of dynamic unity – and John 17:21, that just as the Father is in the Son and the Son in the Father, so the disciples and all believers too should become ‘one’ in the Father and the Son. Here, as I shall argue, Middle and Neoplatonic henology (or doctrine of the One) comes to the fore as a possible background and interpretive lens at the same time. I shall show how Origen joined it to the unifying force of charity-love (agape), in turn a central theme in John, and how Evagrius, performing his exegesis of these verses, interpreted henosis or unification. A coda will explore the corollary of the Divinity ‘all in all’, which is not only a central tenet of Origen’s theology, but also of that of Proclus. It will be pointed out how this concept relates to the issue of the dynamic unity within the divine.