David - 1000 years before Jesus was born - writes about the LORD being his shepherd. And all that he does is good. Safety, security, and rich supply are the LORD's gifts. Eternal joy in his presence is his hope. Confidence in the face of challenge and danger is his fortune.
David identifies the One who supplies all this: the LORD. This is the holy name of God, the One who is, who revealed himself to Moses as "I AM WHO I AM." (Exodus 3:14) He was to tell the children of Israel that "HE WHO IS" had sent him to them. It's lost on us when we use the word, "LORD," even when it's written in ALL CAPS. But this is no throw away term. God has a name - a good name - and wants to be known by us. We can call on his name. He hears and answers when we call.