Why is being in union with Christ important for Christians?

The concept of being in union with Christ is central to the believer's identity and security. In Ephesians 1, Paul emphasizes that believers are chosen in Christ before the foundation of the world, highlighting our intimate relationship with Him. This union means that through faith, we are spiritually immersed in Christ, receiving all the benefits of His work, including redemption, righteousness, and eternal life. As believers walk in this truth, they find a profound sense of peace and purpose, knowing they are secure in God's grace and uncondemned.