Wikipedia : Eastern Orthodox Church
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Salvation
Man, in Orthodox belief, was originally created perfect, but through his own actions he embraced evil through disobedience to God. Because of Man's fall he was condemned, when he died, to go to Hell (Hades); it is believed that from Adam to St. John the Baptist, all men went to a place of separation from God. But when Jesus came into the world he himself was Perfect Man and Perfect God united. Through his participation in humanity, human nature was changed allowing human beings to participate in the divine nature. This process of changing human nature worked retroactive back to the beginning of time, saving all of those who came before, back to Adam. Salvation, or "being saved," therefore, refers to this process of being saved from the fate of separation from God. It is a distinct concept separate from the concept of "going to heaven." The Orthodox have always maintained that salvation belongs to all mankind and membership in the Orthodox Church is not required, however, it also maintains that the best and most complete path to participation in the gifts of God are spelled out by the Orthodox Church alone.
The Orthodox believe that there is nothing that a person can do to earn entrance into Heaven. It is rather a gift from God, who wants nothing more than to restore the original relationship with mankind. However, such a gift has to be desired by the believer, God does not force Heaven on humanity. Man is free to reject it when offered by God.
The ultimate goal of the Orthodox Christian is to achieve theosis, or Union with God. This is sometimes expressed thus: "God became Man so that Man might become God." This process is a "Goal" that is seldom reached by humans, but some have done it. Some of the greatest saints have achieved, in this life, a measure of the next. Of course, the individual who achieves theosis never realizes his accomplishment, as his perfect humility keeps him blind to pride.