Passage
She is a tree of life to them that lay hold upon her: and happy is every one that retaineth her.
She is a tree of life to them that lay hold upon her: and happy is every one that retaineth her.
Proverbs 3:16 Length of days is in her right hand; and in her left hand riches and honour.
Proverbs 3:17 Her ways are ways of pleasantness, and all her paths are peace.
Proverbs 3:18 She is a tree of life to them that lay hold upon her: and happy is every one that retaineth her.
Proverbs 3:19 The LORD by wisdom hath founded the earth; by understanding hath he established the heavens.
Proverbs 3:20 By his knowledge the depths are broken up, and the clouds drop down the dew.
The verse centers on "tree", "life", "hold", "upon", "happy", and "retaineth". It is saying that the verse draws attention to "tree" and "life", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 17's "Her ways are ways of pleasantness and..." into verse 19's "The LORD by wisdom hath founded the...", so "tree" and "life" belong inside that flow. In Proverbs context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "tree" and "life" with trust shaped by these words, not by a vague optimism outside the passage.