This and the other references in Proverbs Proverbs 11:30; Proverbs 13:12; Proverbs 15:4 are the only allusions in any book of the Old Testament, after Genesis, to the "tree" itself, or to its spiritual significance. Further, there is the tendency to a half-allegorizing application of that history. "The tree of life" which Adam was not to taste lies open to his children. Wisdom is the "tree of life," giving a true immortality. The symbol entered largely into the religious imagery. of Assyria, Egypt, and Persia. Philo, going a step further, found in the two trees the ideal representatives of speculative knowledge and moral wisdom; and the same image subserves a higher purpose in the promises and the visions of Revelation 2:7; Revelation 22:2.

She is a tree of life - עץ חיים ets chaiyim, "the tree of lives," alluding most manifestly to the tree so called which God in the beginning planted in the garden of Paradise, by eating the fruit of which all the wastes of nature might have been continually repaired, so as to prevent death for ever. This is an opinion which appears probable enough. The blessings which wisdom - true religion - gives to men, preserve them in life, comfort them through life, cause them to triumph in death, and ensure them a glorious immortality.

She [is] a tree (i) of life to them that lay hold upon her: and happy [is every one] that retaineth her.
(i) Which brings forth such fruit that they who eat of it have life and he alludes to the tree of life in paradise.

She is a tree of life,.... Or "lives" (b); so Christ is called, Revelation 2:7; in allusion to the tree of life in the garden of Eden, Genesis 2:9; he being the author of life, natural, spiritual, and eternal; which souls may come at, and pluck and eat of the fruit which is upon him in great plenty and variety, even all the blessings of grace and glory;
to them that lay hold upon her; which is expressive of an act of faith on Christ, Hebrews 6:18; faith lays hold on the person of Christ as a Saviour, and will have him and no other; it comes to the blood of Christ, and deals with it for pardon and purification; it lays hold on his skirt, who is a Jew, on the robe of his righteousness, and puts it on; it lays hold on his strength, and goes forth in it, in the exercise of grace and discharge of duty; it lays hold on his covenant, the blessings and promises of it, and takes them to itself: and this act supposes danger without him, safety in him, a view of suitable provisions for food and clothing with him; some strength of grace, and some degree of resolution; also condescension on Christ's part to suffer himself to be handled by them; and likewise that he first took hold on them and brought them out of a state of nature to himself: great encouragement there is for sensible sinners to lay hold on Christ; he is set before them in the Gospel to be laid hold on; he never discourages any from so doing, nor casts out any that come to him; he is able to bear the stress of their salvation they lay upon him; multitudes of lost sinners have been saved by him: and he is a tree of life, as the text says, to such persons; they have spiritual life, and the support and comfort of it, from him now, and may expect everlasting life from him hereafter;
and happy is everyone that retaineth her; or "holds her fast" (c); see Song 3:4; as such may be said to do who constantly apply to him for fresh communications of grace; who walk on in him as they have received him, and hold fast the profession of their faith in him. The phrase is expressive of great affection to him, and strong faith in him; faith keeps its hold of Christ through great darkness and many difficulties; oftentimes the soul walks in darkness, and yet stays itself on Christ, and, Abraham-like, believes in hope against hope. Faith is sometimes very low, and yet lets not go its hold; it fails not, through the prevalent intercession of Christ; it cannot so let go its hold as that there is a parting; a partial departing there may be, but not a total one: however, it is sometimes very difficult for faith to keep fast hold of the Redeemer; it is for the honour and comfort of believers so to do; and it is their mercy that interest in Christ, and salvation by him, do not depend on acts of faith; for, though "we believe not, yet he abides faithful", 2-Timothy 2:13; nevertheless happy are they that retain him, or are steadfast in their faith on him; they have much communion with him now, and shall live with him for evermore hereafter.
(b) "lignum vitarum", Montanus. (c) "significatur hoc verbo, firmitas et constantia in tonendo", Michaelis; so Mercerus.

Wisdom allegorized as
a tree of life-- (Genesis 2:9; Genesis 3:22) whose fruit preserves life, gives all that makes living a blessing.

A tree - A pledge of everlasting life. He alludes to the tree of life, and intimates, that this is the only restorer of that life which we have lost by sin.