Sam Williamson preaches on Ezekiel 37, highlighting the vision of dry bones in the desert and the promise of new life through God's word and spirit. He explains that the bones represent humanity's spiritual death and rebellion against God, but God's promise of life is available to all who repent and believe. Sam encourages the congregation to pray and proclaim God's word to those who are dead in their sins, trusting in God's sovereignty and goodness to bring new life to the spiritually dead. He reminds them that God's work is not overwhelming, but simple, and that they can respond in hope, joy, and obedience to God's word.