Psalm 4 is a heartfelt prayer of David, expressing trust in God during times of distress. It highlights the contrast between those who seek fulfillment in worldly things and those who find true peace in God. David calls out to God for help, urges others to turn from sin and trust in the Lord, and ultimately rests in the assurance that God alone provides safety and peace. This psalm teaches that true joy and security come not from circumstances, but from a relationship with God.