Why is the relationship between Jesus and His people referred to as mystical?

The use of the term 'mystical' in describing the relationship between Jesus and His people denotes a profound spiritual union that goes beyond mere physical family ties. This union is grounded in the eternal covenant of grace where believers are spiritually connected to Christ through His death and resurrection. It suggests that while believers are positioned in a physical world, their ultimate identity and relationship with Jesus exist within the realm of spiritual truth and reality, as articulated in passages like Hebrews 2:11, which affirms the unity shared with Christ in sanctification.