Throughout the Bible, God prides Himself on prophecy fulfillment:

Isa 46:10 Declaring the end from the beginning, And from ancient times things that are not yet done, Saying, ‘My counsel shall stand, And I will do all My pleasure,’

Isa 14:24 The LORD of hosts has sworn, saying, “Surely, as I have thought, so it shall come to pass, And as I have purposed, so it shall stand:

Isa 41:26 Who hath declared from the beginning, that we may know? and beforetime, that we may say, He is righteous? yea, there is none that sheweth, yea, there is none that declareth, yea, there is none that heareth your words.

Isa 44:6 Thus saith the LORD the King of Israel, and his redeemer the LORD of hosts; I am the first, and I am the last; and beside me there is no God.
Isa 44:7 And who, as I, shall call, and shall declare it, and set it in order for me, since I appointed the ancient people? and the things that are coming, and shall come, let them shew unto them.

The Augustinian Christians will read these verses and take them as proof positive that God holds the Platonic attribute of Omniscience. But the texts actual indicate the exact opposite. In context (and can be seen in the individual verses), the text is actually about God’s power. God says things will happen, and then has the power to bring them about. In each verse, the author was showing how awesome God was. It is taken for granted that God does not know the future; that is what makes God so mighty. Even in a chaotic future, in which all sorts of things spoil human plans, God’s plans do not fail. That is the point.

For Augustinians to take these verses as Omniscience texts, that destroys the value of what they communicate. It is not very impressive to say “What I think, that will happen. It is because I know the future.” It is very impressive to say “What I think, that will happen. It is because I make it happen.” One is a powerless statement (unnatural in the context), and one is a power filled statement.

Prophecy is God describing His power. Prophecy is not God boasting about knowing things.