The Ladder of Divine Ascent in the context of "Heaven in Christianity"

Eternal life traditionally refers to continued life after death, as outlined in Christian eschatology. The Apostles' Creed testifies: "I believe... the resurrection of the body, and life everlasting." In this view, eternal life commences after the Second Coming of Jesus Christ and the resurrection of the dead, although in the New Testament's Johannine literature there are references to eternal life commencing in the earthly life of the believer, possibly indicating an inaugurated eschatology.

According to mainstream Christian theology, after death but before the Second Coming, the saved live with God in an intermediate state, but after the Second Coming, experience the physical resurrection of the dead and the physical recreation of a New Earth. The Catechism of the Catholic Church states, "By death the soul is separated from the body, but in the resurrection God will give incorruptible life to our body, transformed by reunion with our soul. Just as Christ is risen and lives for ever, so all of us will rise at the last day." N.T. Wright argues that "God's plan is not to abandon this world... Rather, he intends to remake it. And when he does, he will raise all people to new bodily life to live in it. That is the promise of the Christian gospel."

Theosis (Ancient Greek: θέωσις), or deification (deification may also refer to apotheosis, lit. "making divine"), is a transformative process whose aim is likeness to or union with God, as taught by the Eastern Orthodox Church and the Eastern Catholic Churches; a similar concept is also found in the Latin Church of the Catholic Church, where it is termed "divinization". As a process of transformation, theosis is brought about by the effects of catharsis (purification of mind and body) and theoria ('illumination' with the 'vision' of God). According to Eastern Christian teachings, theosis is very much the purpose of human life. It is considered achievable only through synergy (or cooperation) of human activity and God's uncreated energies (or operations).

According to Metropolitan Hierotheos (Vlachos), the primacy of theosis in Eastern Orthodox Christian theology is directly related to the fact that Byzantine theology (as historically conceived by its principal exponents) is based to a greater extent than Latin Catholic theology on the direct spiritual insights of the saints or mystics of the church, in contrast to the traditions of the West which place a greater emphasis on perceived rationality. Byzantine Christians consider that "no one who does not follow the path of union with God can be a theologian" in the proper sense. Thus theology in Byzantine Christianity is not treated primarily as an academic pursuit. Instead it is based on applied revelation (see gnosiology), and the primary validation of a theologian is understood to be a holy and ascetical life rather than intellectual training or academic credentials (see scholasticism).