Original post at http://spartafumcyouth.blogspot.com/2013/01/tree-of-life.html
In addition to the Hebrew Bible verses, the tree of life is symbolically described in the Book of Revelation as having curing properties: "the angel showed me the river of the water of life, as clear as crystal, flowing from the throne of God and of the Lamb down the middle of the great street of the city. On each side of the river stood the tree of life, bearing twelve crops of fruit, yielding its fruit every month. And the leaves of the tree are for the healing of the nations." (Revelation 22:1-2)
In Catholic Christianity, the Tree of Life represents the immaculate state of humanity free from corruption and Original Sin before the Fall.
In Eastern Christianity the tree of life is the love of God.
Until the Enlightenment, the Christian church generally gave biblical narratives of early Genesis the weight of historical narratives. In the City of God (xiii.20-21), Augustine of Hippo offers great allowance for "spiritual" interpretations of the events in the garden, so long as such allegories do not rob the narrative of its historical reality. However, the allegorical meanings of the early and medieval church were of a different kind than those posed by Kant and the Enlightenment. Precritical theologians allegorized the genesis events in the service of pastoral devotion. Enlightenment theologians (culminating perhaps in Brunner and Niebuhr in the twentieth century) sought for figurative interpretations because they had already dismissed the historical possibility of the story.
John Calvin (Commentary on Genesis 2:8), following a different thread in Augustine (City of God, xiii.20), understood the tree in sacramental language. Given that humanity cannot exist except within a covenantal relationship with God, and all covenants use symbols to give us "the attestation of his grace", he gives the tree, "not because it could confer on man that life with which he had been previously endued, but in order that it might be a symbol and memorial of the life which he had received from God." God often uses symbols - He doesn’t transfer his power into these outward signs, but "by them He stretches out His hand to us, because, without assistance, we cannot ascend to Him." Thus he intends man, as often as he eats the fruit, to remember the source of his life, and acknowledge that he lives not by his own power, but by God’s kindness. Calvin denies (contra Aquinas and without mentioning his name) that the tree served as a biological defense against physical aging. This is the standing interpretation in modern Reformed theology as well.