How do we know Christ's authority over the church?

Christ's authority over the church is derived from His divine nature and His accomplished work of redemption. In Isaiah 40:10, it states that the 'Lord God will come with strong hand,' indicating His sovereign rule and power. Moreover, as the one who redeemed His people through His sacrificial death, His authority is affirmed by His function as the head of the church. Ephesians 1:22-23 elucidates that God placed all things under Christ's feet and made Him head over all things for the church, underscoring that His authority encompasses both spiritual governance and redemptive power.