"But you, O LORD, are a shield about me, my glory, and the lifter of my head." (Psalm 3:3).
In his troubles, David remembered the goodness of the Lord. The Lord is a shield for David. Although he faces hardship and experiences discipline for his sin, God does not treat David as his sins deserve. He shields him from many troubles that could come. God treats all of his creation in this way. This is one of the reasons unbelief is so offensive. God is continually preventing many terrible things from happening in each of our lives. We clearly ought to be more grateful to him. The thousands of ways he shields us from troubles all around are merely samples of the greatest way he shields believers, saving us from hell through the gracious work of Christ the Savior.
God is David's glory. Belonging to the Lord brings hope, meaning, purpose, and dignity to David's life. His value does not come from the success of his kingship. I comes from his belonging to God. There is glory in the life of a believer. Life as a child of God is a life that matters. The Christian, whether rich or poor, healthy or ill, learned or unlearned, enjoys a glorious life in the household of the glorious One.
Thus God is the lifter of a believers head. Why are you downcast O my soul? Why are you troubles within me? Hope in God! Whatever troubles may come, the man who belongs to the Lord has reason to keep his chin up.