Passage
Confide in Jehovah, and do good; dwell in the land, and feed on faithfulness;
Confide in Jehovah, and do good; dwell in the land, and feed on faithfulness;
Psalms 37:1 {[A Psalm] of David.} Fret not thyself because of evil-doers, and be not envious of them that work unrighteousness;
Psalms 37:2 for they shall soon be cut down like the grass, and fade as the green herb.
Psalms 37:3 Confide in Jehovah, and do good; dwell in the land, and feed on faithfulness;
Psalms 37:4 and delight thyself in Jehovah, and he will give thee the desires of thy heart.
Psalms 37:5 Commit thy way unto Jehovah, and rely upon him: he will bring [it] to pass;
The verse centers on "faith", "confide", "jehovah", "good", "dwell", "land", "feed", and "faithfulness". It is saying that the verse draws attention to "faith" and "confide", 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 "and delight thyself in Jehovah and he...", so "faith" and "confide" 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 "faith" and "confide" with trust shaped by these words, not by a vague optimism outside the passage.