Passage
Hear me when I call, O God of my righteousness: thou hast enlarged me when I was in distress; have mercy upon me, and hear my prayer.
Hear me when I call, O God of my righteousness: thou hast enlarged me when I was in distress; have mercy upon me, and hear my prayer.
Psalms 4:1 Hear me when I call, O God of my righteousness: thou hast enlarged me when I was in distress; have mercy upon me, and hear my prayer.
Psalms 4:2 O ye sons of men, how long will ye turn my glory into shame? how long will ye love vanity, and seek after leasing? Selah.
Psalms 4:3 But know that the LORD hath set apart him that is godly for himself: the LORD will hear when I call unto him.
The verse centers on "mercy", "hear", "call", "righteousness", "thou", "hast", "enlarged", and "distress". It is saying that the verse draws attention to "mercy" and "hear", so its meaning should be read from those terms before moving to application.
The next verse adds "O ye sons of men how long...", so "mercy" and "hear" 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 "mercy" and "hear" with trust shaped by these words, not by a vague optimism outside the passage.