What does Psalm 28:7 mean?

God is the source of David's power and protection. David rejoices in the Lord and sings praise to Him, because the Lord is the source of his power and protection. As a warrior (Psalm 144:1), David recognizes that the Lord enables him to be strong in the face of his enemy's oppression. A shield not only provides a warrior with physical protection—it also serves to boost the warrior's confidence. Experienced believers can often recall many occasions when the Lord strengthened and protected them. Each victory brings an opportunity to rejoice and be thankful.

Isaiah refers to the Lord as providing power to His people. He writes in Isaiah 40:28–31 that the Lord does not faint or grow weary. He empowers the faint and gives strength to those who have none. Those who wait on the Lord will receive new strength. They will soar like eagles, run without tiring, and walk without fainting.