How do we know the doctrine of Jesus' dual nature is true?

The doctrine of Jesus being both fully God and fully man is evidenced through scripture, especially in passages like Luke 5:21-24. Here, Jesus does not explicitly declare Himself as God when addressing the Pharisees but insists that He, as the Son of Man, possesses the authority to forgive sins. This illustrates His unique dual nature. The affirmation as the God-Man Mediator is crucial since it establishes Christ as the only one capable of bridging the gap between God and fallen humanity, bearing the penalties of sin while retaining divine authority.