- Every omnipotent being is perfectly free.
- Every perfectly free being knows every fact and is not wrong about anything.
- Therefore, every omnipotent being knows every fact and is not wrong about anything.
In particular, open theists can't take God to be omnipotent. There is another route to that conclusion. If open theism is true, God can't now know whether tomorrow I will mow my lawn. But if God couldn't now know what I will write in my next sentence, then he can't intentionally bring it about that right now (open theists need to accept absolute simultaneity, of course) on Pluto there exists a piece of paper saying what my next freely produced sentence will be. But to be unable to do that would surely be a limitation of God's power.