This is highly inspirational.
Our God is greater than all forms of Goliath in our lives because "greater is He that is in us(God) than he that is in the world.
Sometimes we faced challenges so that God can really prove to us how great His power is in our life.
David know the greatness of God that is why He faced Goliath with boldness and confidence in God and God really backed him up to overcome.
We need to build our confidence in God when faced by any Goliath of life.