Augustine of Hippo

"As in the days of the tree of life, so shall be the days of my people." Now, anyone who has ever opened the Scriptures knows where God planted the "tree of life." It was from the fruit of this tree that God excluded Adam and Eve.…Of course, it might be argued that those "days of the tree of life" mentioned by Isaiah are the days that are now being spent by Christ's church, since the "tree of life" is simply a prophetic figure for Christ, for that Wisdom of God that Solomon had in mind when he said that Wisdom is "a tree of life to …

City of God 20.26 ↗

Jerome

The dwelling and plantation of the righteous will be eternal, so that the days of the life of my people may be compared to the days of the life of the tree, about which it is said in the Psalms: The righteous will flourish like a palm tree (Psalm 92:13), triumphing over their adversaries daily and displaying the emblem of victory. …

Commentary on Isaiah ↗

Thomas Aquinas

And he assigns the reason: for as the days of a tree, that is, because they will live a long time just as the wood of a tree lasts a long time, the works of their hands shall grow old, that is, they shall remain in their use until old age: he shall be like a tree which is planted near the running waters (Ps 1:3).

Commentary on Isaiah ↗