Passage
Trust in the LORD, and do good; so shalt thou dwell in the land, and verily thou shalt be fed.
Trust in the LORD, and do good; so shalt thou dwell in the land, and verily thou shalt be fed.
Psalms 37:1 Fret not thyself because of evildoers, neither be thou envious against the workers of iniquity.
Psalms 37:2 For they shall soon be cut down like the grass, and wither as the green herb.
Psalms 37:3 Trust in the LORD, and do good; so shalt thou dwell in the land, and verily thou shalt be fed.
Psalms 37:4 Delight thyself also in the LORD: and he shall give thee the desires of thine heart.
Psalms 37:5 Commit thy way unto the LORD; trust also in him; and he shall bring it to pass.
The verse centers on "trust", "lord", "good", "shalt", "thou", "dwell", "land", and "verily". 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 2's "For they shall soon be cut down..." into verse 4's "Delight thyself also in the LORD and...", so "trust" and "lord" belong inside that flow. In Psalms context, the local focus is worship, trust, the LORD's kingship, and covenant mercy.
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.