Was Athanasius a Sabellian?

The main characteristic of Sabellianism is that God is only one hypostasis (one Person). Sabellianism is sometimes described as similar to Modalism, in which 'Father' and 'Son' are merely two names for exactly the same Person. Others say that Sabellianism did make a distinction between the Father and Son within the one hypostasis, like one can distinguish between the body, spirit, and soul within one human person. While the Trinity doctrine teaches three hypostases in God, Athanasius, like Sabellianism, held that the Father, Son, and Spirit are a single hypostasis: > "The fragments of Eustathius that survive present a doctrine that is > close to Marcellus, and to Alexander and **Athanasius**. Eustathius > insists there is **only one hypostasis**“ (Ayres, p. 69). > > The “clear inference from his (Athanasius') usage” is that “there is > **only one hypostasis in God**” (Ayres, p. 48). > > “Athanasius' most basic language and analogies for describing the > relationship between Father and Son primarily present the two as > intrinsic aspects of **one reality or person**” (Ayres, p. 46). He taught that the Son is an internal aspect of the Father: > “Athanasius' increasing clarity in treating the Son as **intrinsic to > the Father's being**” (Ayres, p. 113). > > “Athanasius' argument speaks not of two realities engaged in a common activity, but develops his most basic sense that the Son is **intrinsic to the Father's being**” (Ayres, p. 114). > > “Although Athanasius’ theology was by no means > identical with Marcellus’, the overlaps were significant enough for > them to be at one on some of the vital issues—especially their common > insistence that the Son was **intrinsic to the Father's external > existence**” (Ayres, p. 106). For Athanasius, just as the Son is part of the Father, the Holy Spirit is part of the Son and, therefore, not a distinct Person or hypostasis: > “Just as his (Athanasius’) account of the Son can rely heavily on the > picture of the Father as one person with his intrinsic word, so too he > emphasizes the closeness of Spirit to Son by presenting the Spirit as > the Son's ‘energy’” (Ayres, p. 214). > > “The language also shows Athanasius trying out formulations that will > soon be problematic. … ‘The Cappadocians' will find the language of > ἐνέργεια [superhuman activity] used of the Spirit … to be highly > problematic, seeming to indicate a lack of real existence” (Ayres, p. > 214). Athanasius opposed the concept of “three hypostases.” He regarded the phrase as "unscriptural and therefore suspicious” (Ayres, p. 174). For Athanasius, the enemy was those who taught more than one hypostasis (Person) in God. The similarity of their theologies allowed Athanasius to form an alliance with the leading Sabellian Marcellus: > “Athanasius and Marcellus now seem to have made common cause against > those who insisted on distinct hypostases in God” (Ayres, p. 106). > > At the time when both Marcellus and Athanasius were exiled to Rome, “they considered themselves allies” (Ayres, p. 106). > > “Athanasius ... continued to defend the orthodoxy of Marcellus” > (Hanson, p. 220). > > Contrary to the traditional account, “it is … no longer clear that > Athanasius ever directly repudiated Marcellus, and he certainly seems > to have been sympathetic to Marcellus’ followers through into the > 360s” (Ayres, p. 106). Athanasius, in writing, declared the Sabellians to be orthodox: > “About the year 371 adherents of Marcellus approached Athanasius, > presenting to him a statement of faith. … He accepted it and gave them > a document expressing his agreement with their doctrine” (Hanson, p. > 801). If Athanasius was not a Sabellian, how did he differ from them?