2 Samuel 5:10 And he became more and more powerful, because the Lord God Almighty was with him.
King David is known as the greatest king of Israel, not because he was a shepherd, a warrior or any other way you describe him!
He was the greatest king of Israel because he chose to listen to God (for the most part) and obey God (again, for the most part.)
Allow God to direct your hearts and minds so you can achieve the impossible, not by your strength, but through what God can do with you!