When it comes to the OT prophets and eschatology, one area of discussion is the “literalness” of prophetic language. Though not everyone agrees, in Reformed theology we see the prophets as speaking the truth in poetic and sometimes apocalyptic ways (similar to the Psalms, Revelation, and other parts of Scripture). Therefore we don’t read the prophets with strict literalism, though we do read them with a view that they are part of the infallible Word of God.
There’s another thing about prophetism worth mentioning: it isn’t always chronological. Sometimes prophecy is unchronological or non-chronological. This matters in eschatology! Here’s how Vos described it:
“Whenever the prophets speak in terms of judgment, immediately the vision of the state of glory obtrudes [imposes] itself upon their view, and they concatenate [join] the two in a way altogether regardless of chronological interludes. Isaiah couples with the defeat of the Assyrians under Sennacherib the unequalled pictures of the glory of the end, and the impression might be created that the latter was just waiting for the former, to make its immediate appearance. The vision ‘hastens’ under their eye. The philosophy of this foreshortening of the beyond-prospect is one of the most difficult things in the interpretation of prophecy in the Old Testament and New Testament alike.”
In other words, although it is a difficult aspect of interpretation, the words of judgment and glory in the prophets aren’t necessarily chronological. For more helpful insight into OT prophetism, see Vos’ Biblical Theology, chapter six, part D (The Judgement and the Restoration: Prophetic Eschatology).
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