Thomas Brooks emphasizes that earthly possessions cannot satisfy the immortal soul, likening those who seek fulfillment in material wealth to swine. He references the folly of a man who believed he could find contentment in earthly pleasures, highlighting that true satisfaction can only be found in a relationship with God. Brooks argues that the soul's spiritual nature makes it incapable of being fulfilled by anything less than divine communion, asserting that no amount of worldly riches can fill the void that only God can satisfy.