Passage
But know that Jehovah hath set apart the pious [man] for himself: Jehovah will hear when I call unto him.
But know that Jehovah hath set apart the pious [man] for himself: Jehovah will hear when I call unto him.
Psalms 4:1 {To the chief Musician. On stringed instruments. A Psalm of David.} When I call, answer me, O God of my righteousness: in pressure thou hast enlarged me; be gracious unto me, and hear my prayer.
Psalms 4:2 Ye sons of men, till when is my glory [to be put] to shame? [How long] will ye love vanity, will ye seek after a lie? Selah.
Psalms 4:3 But know that Jehovah hath set apart the pious [man] for himself: Jehovah will hear when I call unto him.
Psalms 4:4 Be moved with anger, and sin not; meditate in your own hearts upon your bed, and be still. Selah.
Psalms 4:5 Offer sacrifices of righteousness, and confide in Jehovah.
The verse centers on "jehovah", "hath", "apart", "pious", "himself", "hear", and "call". It is saying that the verse draws attention to "jehovah" and "hath", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 2's "Ye sons of men till when is..." into verse 4's "Be moved with anger and sin not...", so "jehovah" and "hath" 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 "jehovah" and "hath" with trust shaped by these words, not by a vague optimism outside the passage.