Passage
By David. Do not fret because of evil doers, Be not envious against doers of iniquity,
By David. Do not fret because of evil doers, Be not envious against doers of iniquity,
Psalms 37:1 By David. Do not fret because of evil doers, Be not envious against doers of iniquity,
Psalms 37:2 For as grass speedily they are cut off, And as the greenness of the tender grass do fade.
Psalms 37:3 Trust in Jehovah, and do good, Dwell <FI>in<Fi> the land, and enjoy faithfulness,
The verse centers on "david", "fret", "evil", "doers", "envious", "against", and "iniquity". It is saying that the verse draws attention to "david" and "fret", so its meaning should be read from those terms before moving to application.
The next verse adds "For as grass speedily they are cut...", so "david" and "fret" should be read forward into that movement. 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 "david" and "fret" with trust shaped by these words, not by a vague optimism outside the passage.