The Mystery of David and Goliath in the Bible is a fascinating illustration of the war between Flesh and Spirit. Paul says:
For the flesh lusts against the Spirit, and the Spirit against the flesh; and these are contrary to one another, so that you do not do the things that you wish. - Galatians 5:17
The story of David and Goliath starts before their battle. Just as we read in the bible, before sitting on the throne, David had overcome the Lion and the Bear. Then he faced his third enemy, Goliath, a Philistine, an Uncircumcised Philistine.
He overcame the first two in the Name of the Lord. Likewise, he approached the third in the same Name. He didn't gather together an army to war against any of these enemies.
These battles are 'within', for the Kingdom of God is "within".
- Philistine speaks of Man's Kingdom trying to find life.
- Israel speaks of God's Kingdom where Life resides.
- Circumcision speaks of 'cutting off the flesh' from man's heart.
- Baptism in Christ is our 'circumcision', where we let go of gathering an army of fleshly 'wisdom' so save ourselves.
- The Name of the Lord is "Israel", that is our Father, and we as "His children are "Israelite".
Who we are in Christ overcomes what we do in flesh to gain life.
Christ is where we let go of "I Am My Own Savior"...and believe JESUS is (God is My Savior).
He doesn't save anyone from Hell. He saves us from 'us'.
He shows "if you try to save yourself, you'll lose".
He showed this on the Cross.
He showed the path of life, by "not saving Himself". He pointed at THE Way of Life on the Cross: 'Stop Trying', and 'Start Trusting'. Stop believing "Why Have You Forsaken Me, My GOD?", and start believing "In To Your Hands I commit Myself, My FATHER".
Then the Father raised the Son in 3 days to show the TWO TREEs were ONE TREE, which is who you are. Finding yourself in yourself is death, Finding yourself in Him is life. Love is the way of life, Fear is the way of death.
You'll live forever, not because you are afraid of death, but because you want to live with the One who is in LOVE with you.
Inasmuch then as the children have partaken of flesh and blood, He Himself likewise shared in the same, that through death He might destroy him who had the power of death, that is, the devil, and release those who through fear of death were all their lifetime subject to bondage. - Hebrews 2:14-15
So the Mystery of David and Goliath speaks of the 'overcoming' stage, before we sit on the throne, as kings, reigning with Christ, as Christ, in our land, which is the fullness of who we are.