When David says, "O God, you are my God," he makes a powerful declaration of personal faith. Commentators note that the second word for "God" in Hebrew is 'El', signifying might and strength. In his moment of weakness and isolation, David isn't just acknowledging God's existence; he is actively claiming the Almighty as his personal source of power and deliverance. This teaches us to confidently claim God as our own, especially relying on His strength when we feel helpless.