In Zechariah 1:16 the prophet is told that ‘a line [a surveyor’s line] shall be stretched forth upon Jerusalem’, and now this third vision extends that earlier imagery. He sees a man sent to measure Jerusalem.
Are we abusing Scripture to interpret the prophets in this way? It would be a shame for any interpreter to try to force the language into a literal mould when Scripture is deliberately using terms which defy physical interpretation. We must allow the prophet the use of this type of image, and not be children in the way we read it. The prophets certainly do speak of literal future events, both in their own lifetimes and beyond, and we should assume a literal interpretation by default. But they also speak of events that are spiritual in nature and which rely on a correspondence between the earthly and the heavenly. They use the language of the Old Testament to describe the realities of the New Testament. This is the way God teaches us; he alone can teach in this way. Only God is able to create concrete types and symbols which foreshadow future spiritual realities. Only he can so superintend history that the way events fell out for Israel and Judah, reflect parallel events in the kingdom of heaven. Only he could know the future, and only he could design a fitting symbol for what lies in the future. This is the genius of divine instruction. The two kingdoms are of such different natures, and yet there are obvious correspondences between them. With the prophets of the Old Testament it is usually not hard to see the point at which they move to the spiritual, but we must not stubbornly hold on to a physical interpretation beyond the point where this is feasible. We must allow God to teach us in this way and not feel we are treading on unsafe ground by understanding prophecy in this way. In the case of Zechariah most of his prophecy is using the symbolic language of prophecy.