How do we know that Jesus was fully God and fully man?

The dual nature of Jesus as fully God and fully man is rooted in biblical revelation. In John 19, we see His humanity displayed in suffering and humiliation, taken to trial as the God-man. At the same time, passages like Galatians 4:4-5 affirm His divine origin, being sent by God, and born of a woman. This union of natures is essential, as it allows Christ to serve as our perfect mediator, able to relate to human suffering while also possessing the divine authority to save. Belief in His full deity and humanity is crucial for understanding the nature of His redemptive work.