Through Zechariah 6:1-8 we have recorded the vision of the four chariots.
In this the last of the eight visions the prophet first sees four chariots, which symbolise the universality and speed and destructive power of God, from between two mountains of brass symbolic of endurance. These chariots are not the chariots of war but those of a ruler, e.g. Joseph while a ruler in Egypt. This vision was given at the end as a picture of the blessed truth that God is the all powerful one and that he endures forever, not one word of his shall fail. So the lesson to the Israelites in Jerusalem is that God is the supreme ruler, the supreme guardian of his people and he is protecting them. All that remains for them to do is to trust him and carry on with the work of building the Temple, for God is in control.