This is a spiritual vision that Zechariah had concerning the rebuilding of Jerusalem. There is more to the world around us than what we can see with our eyes. The angels show Zechariah that God's plans for His people are bigger than simply rebuilding some old walls around the city. Zechariah sees an angels who is measuring the city to see how big it is, but as he is speaking with Zechariah another angel rushes in and tells them both that the city is going to be so big that it will be impossible to put a wall around it. So God has promised, "I will be to her a wall of fire all around, declares the LORD, and I will be the glory in her midst.” (v. 5) In other words, God is doing something bigger and grander than what his people can see with their eyes. He is building a bigger kingdom.
The vision ends with a note of anticipation (v. 13) where everyone in heaven is told to listen up because God is getting up from his throne and is about to speak. There is a vital truth here for all of our work for the Lord: We do not see the entire picture. There is what we plan and intend, and then there is what God intends. His plans are always bigger than ours and His purposes are always more ambitious than ours. If you have been called to a rebuilding work and your labors appear small just remember this prayer: "Now to him who is able to do far more abundantly than all that we ask or think, according to the power at work within us, to him be glory in the church and in Christ Jesus throughout all generations, forever and ever. Amen."