Im not sure where you are getting that. I just said he couldn't see what isn't decided if he's subject to time. That by definition is everything in the future.
I still think you’re making a mistake in thinking there is something in the future to “see”. But I deny that “everything” is unknowable in the future if God can’t see it. For instance, God knows that Satan will be judged and thrown into the lake of fire. God knows that lesser demons will be tormented at some time in the future, assuming Legion was not blowing smoke. God even knows what Satan will attempt to do when God removes restraint on him. Does He know these things because He can “see” them in the future? Or does He know them because He understands Satan and his evil desires, as well as His own plans to deal with Satan and other demons?
Let’s say for now it is the former. Could God change the outcome, and decide to have mercy on Satan? If so, then whatever God was “seeing” was incorrect, and God is shown to not be omniscient.
Let’s say now that the latter is true. Could God have mercy on Satan and not throw him into the lake of fire without damaging His credibility? Think about it while I answer the next part.
Are you serious? What about hundreds of prophecies?
When the Spirit of truth comes, he will guide you into all the truth, for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come.
How?
”How” is an excellent question. Let’s start with your answer, that God can “see” into the future. And seeing into the future, God predicts that Nineveh will be destroyed in exactly 40 days. Nineveh’s king tells all his people to repent with fasting and humility. God already knows that Nineveh will be destroyed…Can He stop the destruction without damaging His credibility, not to mention the credibility of the glasses He’s using to “see” into the future?
There are at least two kinds of prophecy: warnings, from which the subject can escape, and the other kind. Maybe you can tell the difference before the event prophesied either comes to pass or doesn’t, but I don’t know that I can, at least not always. Nineveh was given the contingent kind. But there’s no indication in the message Jonah delivered to them that it was contingent. We do know that It was God’s plan to destroy them, and He changed His plan:
Jonah 3:10 (NKJV) Then God saw their works, that they turned from their evil way; and God relented from the disaster that He had said He would bring upon them, and He did not do it.
That verse tells us how God knew they would be destroyed, so at least in this instance, we know that God “knew” the future because He decided what the future would be. But He decided it contingently, meaning that He reserved the right to change the future. Which means that the future, as a fact, was not something anyone could “see”, even God.
Your verse about the Spirit of Truth also affirms that it isn’t based on “seeing” the future, because the verse says He does not speak of His own authority. Yet if the Holy Spirit is God, He could just look into the future, there’s no need to get permission from the Father to relay something of the future that is part of “all the truth”. That also suggests the Father may not have made up His mind about everything at that time.