What does Psalm 54:2 mean?

This is part of David's plea for rescue (Psalm 54:1). When hiding from the evil king, Saul, David was betrayed by local people in the region of Ziph (1 Samuel 23:19–20). David prayed for the Lord to save him, evoking the character and promises of God by referring to His "name."

Prayer is a vitally important resource. The apostle Paul commands believers at Ephesus to put on the whole armor of God in their battle against the Devil. He portrays the Devil as scheming against them. The Devil employs rulers, authorities, cosmic powers, and spiritual forces of evil in the heavenly places (Ephesians 6:12). In addition to putting on the whole armor of God, Christians ought to pray "at all times in the Spirit, with all prayer and supplication" (Ephesians 6:18). When soldiers battle an enemy, they need to be in constant communication with their superior officers. Similarly, Christian soldiers must not battle the Devil and his cohorts without staying in communication with the Lord, their Commander-in-Chief. David understood the critical need to stay in touch with God through prayer. He urged God to hear his prayer for help.