How do we know that the church is established by God's sovereignty?

From a Reformed perspective, the church is understood to be established and sustained by God’s sovereign purpose. As highlighted in Acts 4:23-24, following the arrest of Peter and John, they returned to their fellow believers to report what had happened, recognizing their assembly as a divine purpose. The assembly, or church, is made up of believers brought together by God’s calling, reflecting His sovereign choice. This underscores that every local congregation exists not by chance but according to God’s sovereign design, fulfilling His promise to gather His people.