Passage
For as grass speedily they are cut off, And as the greenness of the tender grass do fade.
For as grass speedily they are cut off, And as the greenness of the tender grass do fade.
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,
Psalms 37:4 And delight thyself on Jehovah, And He giveth to thee the petitions of thy heart.
The verse centers on "grass", "speedily", "greenness", "tender", and "fade". It is saying that the verse draws attention to "grass" and "speedily", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 1's "By David Do not fret because of..." into verse 3's "Trust in Jehovah and do good Dwell...", so "grass" and "speedily" 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 "grass" and "speedily" with trust shaped by these words, not by a vague optimism outside the passage.