Why is Jesus the head of the church?

Jesus is referred to as the head of the church in Colossians 1:18, signifying His preeminence and authority over all believers. As the perfect prophet, priest, and king, He mediates between God and humanity, fulfilling the covenant of grace. His complete obedience and sacrificial death establish the foundation for the church and provide believers with the necessary grace to be reconciled to God. Thus, the church exists under His lordship, receiving direction and life from Him, affirming His role as the head.