In Eastern Orthodox and Eastern Catholic theology, theosis, meaning divinization (or deification or, to become god), is the call to man to become holy and seek union with God, beginning in this life and later consummated in the resurrection. Theosis comprehends salvation from sin, is premised upon apostolic and early Christian understanding of the life of faith, and is conceptually foundational in both the East and the West. * Alternative spellings: Theiosis, Theopoiesis, Theōsis * Related terms: Consecration, Deification, Divine Union, Sanctification