Thomas Brooks emphasizes the profound promise of God in Hebrews 13:5, reminding believers that despite their circumstances, including loss and hardship, they can find contentment in God's unwavering presence. He reassures that God's promise to never leave or forsake us encompasses all aspects of life, providing necessary support and assistance in times of need. Brooks encourages Christians to adjust their mindset to align with their current means, trusting that God will supply all their needs and deliver them from distress. The sermon highlights the assurance of God's help in overcoming challenges and suffering, reinforcing the importance of faith and reliance on God's promises.