Brian Guerin emphasizes the necessity of faith in the life of a believer, illustrating that faith must be active and accompanied by works to be effective. He discusses how speaking in faith and taking action are crucial components in manifesting God's promises, using biblical examples such as Peter healing the lame man and Elisha's miracles. Guerin encourages the congregation to recognize the power of their words and the importance of stepping out in faith, even when circumstances seem impossible. He challenges listeners to examine their own faith and works, urging them to take bold steps in their spiritual journey.