Brian Guerin emphasizes the profound importance of intimacy with Jesus in his sermon 'Discovering Deep Intimacy.' He shares personal experiences and revelations about how God communicates through various means, urging believers to overcome the fear of deception and instead focus on cultivating a close relationship with Christ. Guerin highlights that true transformation and understanding come from spending time in the secret place with God, where one can experience His presence and guidance. He encourages the congregation to embrace this intimacy, as it opens the door to deeper spiritual experiences and a more profound understanding of God's voice.