What does the Bible say about the Spirit of Christ?

The Spirit of Christ, as referenced in Romans 8:9, highlights the importance of the Holy Spirit in the life of a believer. According to Scripture, all true religion is a work of the Spirit of God. The indwelling of the Spirit enables Christians to live in accordance with God's will and confirms their identity as belonging to Christ. The Apostle Paul asserts that if any man does not have the Spirit of Christ, he is none of His, emphasizing that the presence of the Holy Spirit is an essential evidence of genuine faith and relationship with Christ.