King Saul sent his thugs to surround the house of David. They were to kill David at the first opportunity they had. David wrote "I will sing praises to God in the morning" He felt quite confident that he world survive the night. In this Psalm he describe why he felt so confident, God was his strength, defense and refuge in time of trouble. When we are surrounded by those who want our destruction, when we feel frightened or scared, when we are overwhelmed we should be like David and look to God as our defense, strength and refuge.