How do we know God's chosen people are secure?

In Zechariah 3:2, we see that the Lord has chosen Jerusalem, indicating His sovereign choice. This selection implies a deep commitment from God towards His people. The priest Joshua, wearing filthy garments, is told that his iniquity has passed from him, signifying the cleansing power of God's grace. Being 'plucked out of the fire' reinforces the idea that true believers are saved from ultimate judgment. They are secured not by human effort but by the blood of Christ that removes their guilt. Therefore, our security lies in the faithfulness of God and the completed work of Christ on the cross, assuring us that He will keep His people safe.