God not only prepared David, but God provided the proof. David saw the hand of God at work, and had experienced God's faithfulness many times. He knew that God would deliver him, not because of what he read or heard, but because of what God had already done.
1st Samuel 17:37
Moreover David said, "The LORD, who delivered me from the paw of the lion and from the paw of the bear, He will deliver me from the hand of this Philistine." And Saul said to David, "Go, and the LORD be with you!"
Like David, we need to put things into perspective. Yes Goliath was big, but David served an awesome God. He knew that God would deliver him, because God had always been faithful. When you are facing the giant, remember God's faithfulness, and all the times He has delivered you.
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