For this reason some persons ascribed to him the work on Ascetics, which is usually regarded as the production of Saint Basil of Caesarea.
Eustathius was the teacher of Macrina, Basil, Naucratius, and Gregory, who also emphasized asceticism and the rejection of slavery and social injustice.
[5] Eustathius also created charities including almshouses, hospitals, refuges, and likely inspired Basil's plan to build a hospice.
Nicephorous states that although he had signed the decrees of the Council of Nicaea, he yet openly sided with the Arians.
[3] In 340, the Synod of Gangra condemned Eustathius and his followers for their more radical views including the complete abolition of slavery and exaggerated asceticism among other things.