How does the key called promise help in times of despair?

In times of despair, the 'key called promise' represents the assurance of God’s faithfulness and the hope found in His word. As Christian discovered in Pilgrim's Progress, this promise unlocks the dungeons of despair, reaffirming that salvation and fulfillment come through Christ alone. David, in his last words, epitomized this fact by stating that this promise was all his salvation and desire, showing the believer’s call to cling to God's promises even amidst overwhelming trials (2 Samuel 23:5). The key is a reminder that, despite our circumstances, we have access to the peace and strength that God provides, enabling us to persevere in faith.