Passage
The dayes of man are as grasse: as a flowre of the fielde, so florisheth he.
The dayes of man are as grasse: as a flowre of the fielde, so florisheth he.
Psalms 103:13 As a father hath compassion on his children, so hath the Lord compassion on them that feare him.
Psalms 103:14 For he knoweth whereof we be made: he remembreth that we are but dust.
Psalms 103:15 The dayes of man are as grasse: as a flowre of the fielde, so florisheth he.
Psalms 103:16 For the winde goeth ouer it, and it is gone, and the place thereof shall knowe it no more.
Psalms 103:17 But the louing kindnesse of the Lord endureth for euer and euer vpon them that feare him, and his righteousnes vpon childrens children,
The verse centers on "dayes", "grasse", "flowre", "fielde", and "florisheth". It is saying that the verse draws attention to "dayes" and "grasse", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 14's "For he knoweth whereof we be made..." into verse 16's "For the winde goeth ouer it and...", so "dayes" and "grasse" 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 "dayes" and "grasse" with trust shaped by these words, not by a vague optimism outside the passage.