Everything under heaven belongs to God.
God is unshakable.
And if my focus is on Him, then my belief is unshakable in Him.
Otherwise if I look around at the chaos of this world, my faith can become as unstable as the circumstances around me.
Causing my faith to turn to fear.
My fear becomes unbelief.
And my unbelief will keep me out of eternity with my loving Savior, Jesus.