How do we know that Jesus is God and man?

The union of Christ's divine and human natures is a profound mystery emphasized in the sermon. Jesus is eternal, co-equal with the Father, and participated fully in human experience without losing His divine essence. The hypostatic union, where His two natures are united in one person, ensures He could represent us as our mediator and substitute. Scripture affirms this mystery, stating that 'God was manifest in the flesh' (1 Timothy 3:16), which underscores the necessity of both natures for the redemption of humankind.