Passage
Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Proverbs 3:5 (KJV)
Nearby Context
Proverbs 3:3 Let not mercy and truth forsake thee: bind them about thy neck; write them upon the table of thine heart:
Proverbs 3:4 So shalt thou find favour and good understanding in the sight of God and man.
Proverbs 3:5 Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Proverbs 3:6 In all thy ways acknowledge him, and he shall direct thy paths.
Proverbs 3:7 Be not wise in thine own eyes: fear the LORD, and depart from evil.
Study Lenses
The verse centers on "trust", "lord", "thine", "heart", "lean", and "understanding". It is saying that the verse draws attention to "trust" and "lord", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 4's "So shalt thou find favour and good..." into verse 6's "In all thy ways acknowledge him and...", so "trust" and "lord" 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 "trust" and "lord" with trust shaped by these words, not by a vague optimism outside the passage.