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

Spiritual union with Christ is a fundamental truth of sovereign grace theology. According to the Scriptures, those whom God has chosen and redeemed are given new life through the Holy Spirit. This regeneration leads to transformative faith, repentance, and a desire to obey Christ's commandments. In John 15:5, Christ describes Himself as the vine and believers as the branches; apart from Him, we can do nothing. This union is not based on human effort but is a divine work of grace that produces genuine fruit in the lives of the elect, confirming their relationship with Christ.