This sermon explores the person and work of the Holy Spirit, emphasizing that He is the third person of the Trinity who dwells within every believer at the moment of salvation. The teaching highlights the theological shift from the Old Testament, where the Spirit came upon individuals temporarily, to the New Testament reality of permanent indwelling, making believers the temple of God. Key functions of the Spirit are outlined, including sealing the believer for eternal security, convicting the world and the church of sin to drive them toward repentance, and empowering believers to witness boldly. The message encourages a daily dependence on the Spirit for filling, resulting in the manifestation of spiritual fruit such as love, joy, and peace. Ultimately, the sermon presents the Holy Spirit as the agent who unites the church, transforms the believer's character, and guarantees the completion of God's redemptive work. Questions: Who is the Holy Spirit, and is He God? [x] Does every Christian receive the Holy Spirit when they are saved? [x] How can I know if the Holy Spirit lives inside me? [x] What is the difference between the body, soul, and spirit? [x] What does it mean that a Christian is the temple of the Holy Spirit? [x] Can a Christian lose their salvation if they sin? [x] What does it mean to be sealed by the Holy Spirit? [x] How does the Holy Spirit convict us of sin? [x] What is the difference between being indwelt by the Holy Spirit and being filled with the Holy Spirit? [x] How does the Holy Spirit give Christians power to witness? [x] What are the signs that the Holy Spirit is working in my life? [x] What is the fruit of the Spirit?