The sermon explores the profound significance of the Holy Spirit's indwelling in believers, contrasting it with the experience of Old Testament saints and emphasizing its transformative power. Drawing from 1 Corinthians 3 and John 14, the message clarifies the distinction between baptism, which places believers into Christ, and indwelling, which allows Christ to reside within them, offering assurance, strength, and perfect intercession. Pastor Moore cautions against grieving the Spirit through division, deception, and defilement, while celebrating the indwelling Spirit as a source of spiritual sealing, empowerment, and a guarantee of God's promises, ultimately urging listeners to recognise and honour the Spirit's presence in their lives.