David would not allow a pagan to defy his God. He was jealous for the God of Israel. David had to rely on the past faithfulness of God to be willing to step into the battle with his greatest enemy yet. David knew God alone would defeat Goliath. He refused to wear another man’s armor, and simply relied on his own anointing. We must do the same. We cannot try to be someone we are not; we have to step into what God has called us to, trusting that He alone is enough.