A Psalm of Trust
David called on God when he was in a very dangerous and difficult circumstance in the presence of his enemies. This Psalm is a result of that moment.
David invites others to praise God with him. His admonishment in this Psalm is to fear the LORD. There is no want to those who fear Him because He will supply all their need. God is always looking out to protect those that fear Him. His people will face difficult and trying circumstances (like the one David faced) but God will deliver them from them all!