How do we know that our union with Christ is true?

The reality of our union with Christ is confirmed through faith, which acts as the evidence of this relationship. As believers partake in Christ's life, death, and resurrection, they exhibit a change that aligns with their union with Him. Galatians 2:20 articulates this beautifully when it says, 'I am crucified with Christ. Nevertheless, I live; yet not I, but Christ liveth in me.' This illustrates that the Christian life is empowered by Christ Himself, which serves as validation of our union. Moreover, our faith unites us with the Holy Spirit, who dwells within us, attesting to the truth of our spiritual state. Therefore, the internal witness of the Holy Spirit, coupled with the external truths of scripture, solidifies our assurance in this unbreakable union.