What does Isaiah 21:12 mean?
In this tiny oracle, an Edomite has come to Isaiah from the hill country of Seir. This person has come to ask the prophet the question that must have been on the minds of many during the time of the Assyrian Empire. They want to know how much longer will this oppression and suffering continue (Isaiah 21:11)?Isaiah responds, but his answer is not satisfying. He assures the person that "morning will come." But he also indicates that the night is not finished: it will either continue or come again. In other words, Isaiah offers no specific information beyond the vague idea that morning will eventually come. The dark time will ultimately end.
Still, Isaiah invites the Edomite to come back and ask again if he wants to. This may mean that Isaiah expects to know a more specific answer later. Perhaps he is also commending the asker for his humility in reaching out to a prophet of the Lord God of Israel for insight. "Don't stop asking," Isaiah says, in a sense. This person had come to the best source of truth.