Peace be with you.
Adam and Eve were created and given the freedom to eat from EVERY tree that is desireable to satisfaction except from the tree of the knowledge of good and bad. They were not to eat from this tree, because if they partook of such tree, that tree would induce the knowledge of good and the knowledge of bad.. which would eventually bring them death.
The tree of life, however, was designed to do then as it is designed to do now, impart everlasting life. The tree of life was in the garden of Eden, which is not an 'earthly' garden, for it says:
"I know a man in union with Christ who, fourteen years ago -whether in the body I do not know, or out of the body I do not know; God knows -was caught away to the "third HEAVEN." Yes, I know such a man -whether in the body or apart from the body, I do not know, God knows -that he was caught away into paradise (or "garden of Eden," see the NWT footnote) and heard unutterable words which is not lawful for a man to speak." (2 Corinthians 12:2-4)
The 'garden of Eden' is in the third heaven. For in Revelation 2:7 he says,
"Let the one who has an ear hear what the spirit says to the congregations: To him that conquers (and receives "heavenly life") I will grant to eat of the tree of life, which is in the 'garden' of God."
Those who gain 'heavenly life' will be in the garden of Eden, the heavenly garden partaking of the tree of life.
The 'tree of life' that all nations must eat from that IMPARTS everlasting life is our Lord, for he says:
"Whoever drinks from the water that I will give him will never get thirsty at all, but the water that I will give him will become in him a fountain of water bubbling up to IMPART everlasting life." (John 4:14)
"Unless you eat the flesh of the Son of Man and drink his blood, you have no life in yourselves. He that feeds on my flesh and drinks my blood has everlasting life, and I will resurrect him on the last day" (John 6:53, 54).
The Christ is the man who is happy because he "has not walked in the counsel of the wicked ones, and in the way of sinners he has not stood, and in the seat of ridiculers he has not sat. But HIS delight is in the words of JAH, and in an undertone he observes them day and night." That is why He has become "a tree [of LIFE] that is planted by streams of water, that gives fruit in its own season and the foilage of which does not wither, and EVERYTHING he does will not succeed." (Psalms 1:1-3).
This was fulfilled by the Son in Revelation 22:1, 2 when John says, "And he showed me a river of water of life, clear as crystal, flowing out from the throne of God and of the Lamb down the middle of its broad way. And on this side of the river and on that side the TREE OF LIFE producing twelve crops of fruit, yielding their fruits each month. And the leaves of the trees for the curing of the nations."