Why is Christ's doctrine important for Christians?

The doctrine of Christ encapsulates the essence of the Gospel, centering on His person and work. Without understanding who Christ is and what He accomplished through His death and resurrection, the message of salvation loses its significance. As 2 John 9 clarifies, the doctrine of Christ is foundational; those who abide in this doctrine have both the Father and the Son. Understanding Christ's role illuminates how His work applies to believers and assures them of eternal life. Therefore, knowing Christ personally is paramount to the Christian faith.