How do we know that we are in union with Christ?

We can know we are in union with Christ through the testimony of Scripture and the work of the Holy Spirit in our lives. According to John 17:21, Jesus prays for believers to be one with Him, reflecting the intimate union He has with the Father. This union is not dependent on feelings but on God's sovereign action in grafting us into Christ, as depicted in Romans 11, where Paul discusses how believers are partakers of Christ's nourishment. The transformative experiences of faith and a newfound desire to live righteously further affirm this union, evident in how we respond to sin and pursue holiness through the power of the Spirit (Galatians 2:20).