How do we know spiritual life comes from believing in Christ?

In the context of spiritual life, belief in Christ serves as evidence of being spiritually alive. As indicated in John 3:18, 'He that believeth on Him is not condemned: but he that believeth not is condemned already.' This highlights that spiritual life, which is characterized by faith in Christ, is granted to those whom God has elected and called. The new birth, as described in John 3, occurs by the Holy Spirit, allowing individuals to recognize and respond to the light of Christ. Thus, our faith is not a mere decision but a divine gift, confirming that spiritual life indeed originates from God's sovereign grace.