Why is the union of believers with Christ essential?

The union between Christ and His people is profound and essential for understanding the fullness of salvation. As Jesus prays in John 17, this union establishes a relational bond wherein believers are protected and sanctified through His truth. It is not merely a theological concept; this union signifies that believers are fully accepted by God and will ultimately behold His glory. It assures them of their eternal security and the transformative work of the Spirit in their lives, affirming that they are united in love and purpose with Christ.