John Piper, in Beyond the Bounds: Open Theism and the Undermining of Biblical Christianity, offers a challenge to God’s prophecy accuracy if Open Theism is correct in its understanding of an open future. He writes:
If Scripture contains predictions and prophecies about the future, which most evangelicals admit, then how is God able to guarantee that these predictions will come to pass as he has predicted?
Before answering Piper, an objective reader must first step back and make some predictions. An objective reader could build a hypothesis about how the Bible would treat prophecy in both closed and open hypothetical scenarios. The objective reader then could look how the Bible actually treats prophecy and see if the Bible better fits the closed or open model.
An Open Future:
1. Prophecies by God would be contingent on current knowledge, predictable events, or even God’s own power to make things happen.
2. When the Bible describes the methodology about how God knows the future, it would describe one of these three methodologies.
3. It would not describe God knowing the future in the ways predicted by the closed view of God.
4. Some prophecies would be subverted by the actions of human beings, new conditions changing prophecy.
5. Some prophecies would downright fail.
A Closed Future:
1. Prophecies by God would be contingent on God seeing the future (timelessness), God inherently having all knowledge, or God controlling all events (sovereignty).
2. When the Bible describes the methodology about how God knows the future, it would describe EXCLUSIVELY one of these three methodologies.
3. It would not describe God knowing the future in the ways predicted by the open view of God.
4. No prophecies would be subverted by the actions of human beings.
5. No prophecies would fail.
The problem for the closed view is that all the common sense predictions of their model are not found in the Bible. When the Bible talks about what God knows, it is not unknowable things. Where the closed view claims this, the text is ambiguous (e.g. the names in the Book of Life). When God describes how He knows things, it always gives a methodology denied by the closed view:
Isa 48:3 “I have declared the former things from the beginning; They went forth from My mouth, and I caused them to hear it. Suddenly I did them, and they came to pass.
Notice that God declares things and then God does them. The entire 9 chapters from Isaiah 40 through 48 speak explicitly about God’s power to bring about prophecy. God knows the future because God is powerful. Prophecy speaks to power, not knowledge. There is no hint of any assumption of a closed future. In fact, no scripture speaks towards God having inherent knowledge of the future, controlling all events, or seeing the future like a movie.
Many of the direct prophecies by God do not come true precisely because of human action: the prophecy of Nineveh being of primary exhibit. Sometimes prophecies (such as the prophecy of Tyre or the prophecy of expelling foreign nations from the Promised Land) fail for no apparent reason. Failed or subverted prophecy is not the norm, but it does occur throughout the Bible. The Bible offers no apologies; that task is left for the Calvinists.
So, in what way does Piper believe God “guarantees” prophecy? Is God guaranteeing in the sense that nothing could subvert the prophecy ever? That does not seem to be God’s standard. It seems again Piper is letting his philosophy interpret the Bible rather than the Bible his philosophy.