Interesting discussion. rcwitness, are you asking more about the Tree of Life, or about the Tree of Knowledge, because they are distinct in Gn 2:9
“And the Lord God brought forth of the ground all manner of trees, fair to behold, and pleasant to eat of: the tree of life also in the midst of paradise: and the tree of knowledge of good and evil.” (Douay-Rheims)
I checked several translations and the language of each indicates two separate trees - that of the CEV (ugh) is really specific, and I’m inclined to think that these are different. Note the contrast in Gn 3:22
“And he said: Behold Adam is become as one of us, knowing good and evil: now, therefore, lest perhaps he put forth his hand,
and take also of the tree of life, and eat, and live for ever.” (Douay-Rheims, emphasis mine)
Namely that Adam and Eve have partaken of the Tree of Knowledge and the Lord explicitly wishes them not to also take of the Tree of Life.
The phrase “Tree of Life” is used poetically in the Proverbs to describe wisdom (Pr 3:18), righteousness (Pr 11:30), patience (Pr 13:12), gentle speech (Pr 15:4). It then appears again in Revelation, to describe the rewards awaiting us in Heaven, specifically for those who are victorious (in the sense of repenting and returning to Christ, Rev 2:7), those who wash their robes in the Blood of the Lamb (Rev 22:14, alluding to Rev 7:14). The allusions are strongly towards the redemption of Israel (as is much of Revelation), since the Tree of Life bears 12 crops of fruit every month (Rev 22:2), and is fed by the River of Life which flows from the Throne of God. This Tree is healing and nourishing at the same time.
So I think we can find support in Scripture for much of what has been written here:
(1)
It makes sense to be the cross and the fruit is Jesus. The fiery sword is the pain Jesus endured.
(2)
I would say the allegorical sense of the Tree of Life is the Cross.
(3)
Life came to us through Jesus and Jesus came to us through Mary. The fruit of Mary’s womb is Jesus. God stationed a Cherubim and firey sword to protect Mary from all impurity until she should bear fruit - Jesus - who gives us life.
(4)
This tree of life is Christ himself: ‘He that eats my flesh and drinks my blood abides in me: and I in him (Jn 6:57).’ (St. Thomas Aquinas) Or the Tree of Life is Sacred Scripture. (Hugh of St. Cher) Or the phrase is figurative, for by the tree of life he means the blessed and eternal life, which the saints will enjoy in the kingdom of God, which he has called Paradise. (Oecumenius)
As was pointed out, Scripture can have multiple meanings, and I wish to add that the meaning given to those for whom this was first written was likely distinct from the meaning given us who receive the fulfillment of Scripture, but no less true. To them, clearly, we began in friendship (as Copland and Joe pointed out), fell from that friendship and a barrier remains in place. Yet that didn’t prevent the Lord God from reaching out to Israel and Israel reaching back for God - note again the author of proverbs talking of the ways in which God sustains us (through love, a calm spirit, an obedient heart). Christian revelation restores us fully to God. While Israel was required to make material sacrifice for sins, the Church has received her final sacrifice and is redeemed, even while she continues to redeem.
So I would take the meaning of the Tree of Life to signify the Grace that both prepares us for Heaven, and the promised reward of Heaven, and therefore this Grace manifests itself in multiple ways. In Christ (Jn 1:14, and others), as well as in His martyrs (Ac 6:8), His prophets (Lk 1:15), Mary (Lk 1:28), conversion (Ac 18:27, and others), the Church (Rom 1:5, among others).
Christ, I think, is the first in this order rightly because He is the source (Rom 5:2) of access to the Lord, of victory over Satan (Rom 16:20), and the reason for God to find favor in us (Eph 2:4-7, and others). This Grace is the source from which all other Grace flows in the service that all, from Mary to Paul to Benedict to Fr. Gary to each of us on these boards, are able to render the Lord (Eph 3:2,7, 4:2, 2 Th 1:12, 2 Ti 1:9, and others). So if we are to give any meaning to the Tree of Life, we must start with Jesus Christ, Lord and Savior, Doctor and Protector.