How do we know that spiritual union is true?

Spiritual union is affirmed by multiple passages in Scripture that reveal the relationship between Christ and believers. In John 14:20, Christ states that He is in the Father, and believers are in Him and He in them. This profound statement points to the indwelling and unbreakable connection that exists between Christ and His followers. Furthermore, the apostle Paul describes believers as members of Christ’s body, indicating that this union is not based on human initiative but is divinely orchestrated. The work of the Holy Spirit enables individuals to comprehend and embrace this truth, as spiritual mysteries cannot be understood through human intellect alone but require divine revelation.