What does Psalm 55:8 mean?

This psalm began with David expressing intense fear and an imminent threat of death (Psalm 55:1–5). Later verses also mention betrayal by an ally (Psalm 55:12–13). It's possible this refers to the treachery of Ahithophel (2 Samuel 15:31) and David's need to evacuate to escape his rebelling son, Absalom (2 Samuel 15:14). Since David fled from Absalom and dire danger, seeking safety, his words here would be entirely appropriate.

David's poetic language here describes his situation as a violent thunderstorm. He was distressed and fearful of his enemy; he experienced not only danger, but also chaos and noise. Taking shelter from a storm, to escape wind and rain, would be the equivalent of running into the wilderness to escape murderous enemies. However, David knew that physical escape would not cure his inner turmoil. As this psalm continues, he will express utter faith in God (Psalm 55:16). In other songs, David reinforced this idea of relying on God despite one's fears (Psalm 23:4).

Only the Lord is a haven in times of trouble. Instead of trusting in natural defenses, David and all believers can trust in a supernatural refuge. The Lord is the perfect place of safety for His people. The psalmist testifies in Psalm 46:1: "God is our refuge and strength, a very present help in trouble." He affirms that neither earthquakes, the casting of mountains into the sea, nor tidal disturbances can cause believers to fear because God is their refuge (Psalm 46:2–3). Jesus told his frightened disciples: "Peace I leave with you; my peace I give to you. Not as the world gives do I give to you. Let not your hearts be troubled, neither let them be afraid" (John 14:27).