Why is belief in God essential for joy?

Belief in God fundamentally undergirds the joyful experience of a Christian's life. C.H. Spurgeon emphasizes that without faith, worries and doubts obstruct the overflowing joy God intends for us. The assurance that 'the Lord is my shepherd; I shall not want' liberates believers from the bondage of anxiety, enabling them to embrace the fullness of joy that God offers. True joy emanates from a deep trust in His providential care, leading to an overflowing cup that celebrates God's goodness and grace in every circumstance.