David Wilkerson emphasizes that being 'in Christ' involves a continuous process of renewal, a deep reverence for Scripture, and the presence of unconditional love in our lives. He explains that true believers are not satisfied with a one-time conversion but seek daily transformation by the Holy Spirit. Furthermore, Wilkerson highlights that our lives should be governed by God's Word, and without love, even the greatest gifts and faith are meaningless. The sermon calls for a genuine examination of our faith and actions to ensure they align with being in Christ.