How do we know God's mercy is enduring?

The phrase 'for his mercy endureth for ever' repeated in Psalm 107 reflects the unchanging nature of God's mercy. This psalm begins with a call to gratitude, directing the redeemed to acknowledge God’s unwavering goodness. It recounts the experiences of those who have called out to Him in times of trouble and highlights God’s faithfulness in delivering them. The promises of God to His people are founded on His character, which remains faithful through all circumstances, assuring us that His mercy is everlasting.