What does the Bible say about God's control over opportunities?

In Revelation 3:7, we see that the Lord Jesus Christ holds the key of David, symbolizing His authority over all things. It is God alone who opens doors of opportunity for His churches, and this divine action is central to our understanding of His sovereignty. Churches exist to fulfill His will, and if no door is opened by God, there would be no church or opportunity for ministry. This truth humbles us and reminds us of the need to rely solely on God for all aspects of life and salvation.