What does it mean to be called to union with Christ?

The call to union with Christ is foundational to the Christian faith, signifying a divine initiative in which God unites believers to His Son through the Spirit. According to 2 Timothy 1:9, this calling is not based on human works but is rooted in God's purpose and grace. Believers are spiritually resurrected with Christ, participating in His life, death, and resurrection. This union transforms their identity and empowers them to live in accordance with God's will, illustrating that it is His grace that brings about a new creation free from sin's bondage.