Proverbs 3:18: She is a tree of life to them that lay hold upon her: and happy is everyone that retaineth her.
In this conditional promise the “she” and the “her” is Wisdom. The Wisdom of God is personified as a woman. This Person is also spoken of as the Son of God, even though Jesus is not a woman.
Wisdom and Jesus are regarded as a tree of life. Wisdom provides food for practical living during this temporal life. Jesus provides food for truly living eternally. Wisdom is in the Word of God; Jesus is the Word of God. We receive from the Word the Law of God which contains the wisdom designed to make one wise to live a happy life. We receive from the Word the Gospel which contains life, forgiveness of sins, and salvation.
There was a Tree of Life in the Garden of Eden, which if a man should eat of it he would live forever. But when the man and the woman disobeyed God by eating of the other tree they were banned from ever approaching the Tree of Life and living in a wretched state of sin forever. The Tree of Life will appear in the New Jerusalem of the New Creation. Until then Jesus is now the Tree of Life for us to partake of now by faith and receive the eternal life.
Meanwhile, we listen to Jesus for He has the words of eternal life. We also pay attention to the Wisdom of God in order lead a pleasant and peaceable life.