Apokatastasis

In theology, apokatastasis (Greek: ἀποκατάστασις, romanized: apokatástasis, also spelled apocatastasis) is the restoration of creation to a condition of perfection. In Christianity, the term refers to a form of Christian universalism, often associated with Origen, that includes the ultimate salvation of everyone, including the damned and the Devil. The New Testament (Acts 3:21), speaks of the "apokatastasis of all things". The dogmatic status of apokatastasis is disputed, and some orthodox fathers such as Gregory of Nyssa taught apokatastasis and were never condemned.

Apokatastasis was definitely condemned as a heresy by the Synod of Constantinople of 543.