Why is the concept of union with Christ important for Christians?

The union with Christ is a central theme in Reformed theology, emphasizing that believers are intimately connected to Him in everything He accomplished. This union assures us that Christ's obedience in fulfilling the law is attributed to us, and His death serves as our substitutionary atonement. In Ephesians 2:18, it illustrates that through Christ, we have access to the Father, which signifies the importance of this relationship for prayer, worship, and communion with God. Furthermore, understanding our union with Christ provides believers comfort and security, knowing that as He cannot be lost or condemned, neither can we. This profound connection is fundamental, defining our spiritual lives and our hope in eternal life.