Jesus is fully God and also became fully human to save mankind and bring him back again to a right relationship with God as it was in the Garden of Eden. This is a difficult concept for many to accept. But this view on the dual nature of Christ was affirmed centuries ago by the early church leaders. They made this declaration to fight against various heresies that crept in during their times and continue to surface again and again throughout the centuries up to our time today. Heresies continue to surface and the church needs to continue to be on guard against all sorts of false doctrines and beliefs.
It is interesting to note that even after Jesus has already ascended back to heaven, the apostle Paul said that Jesus Christ continues to be fully human even as he continues to be fully God. “For there is one God and one mediator between God and men, the man Christ Jesus” (1 Timothy 2:5).