From the Calvinist run Facebook group Open Theism Debate:

Peter Zacharoff BIBLE VERSES PROVING OPEN THEISM ERROR
Psalm 147:5 ESV
Great is our Lord, and abundant in power; his understanding is beyond measure. …

Gene William Steele Thanks for posting those scriptures. Would you like to discuss one of them?

Peter Zacharoff Any

Gene William Steele Great. Let’s start with the first one. Psalm 147:5 ESV
Great is our Lord, and abundant in power; his understanding is beyond measure.

I think that Open Theists would concur that we cannot measure God’s understanding, so how would this be a proof text against Open Theism?

Peter Zacharoff Future knowledge is limited in Open THEISM, by definition. This limitation cannot be put on God’s understanding of future events.

Gene William Steele Yeah but how do you get that from the verse?

Peter Zacharoff It is plainly advanced in the Word “understanding” coupled with “beyond measure,” the obvious conclusion is that God has limitless knowledge of future events since all understanding, including knowledge of future events, is unlimited. Thus, foreknowledge is unconditional in His omniscience.

Gene William Steele So the phrase ‘beyond measure’ means limitless, is that what you are saying?

Peter Zacharoff Yes

Gene William Steele Ok thanks

Peter Zacharoff Intrinsically, His foreknowledge is unconditional, but the content is conditional based on human choice. He knows the choices we will make.

Gene William Steele So in Psalm 147 the Hebrew words are ‘ayin micpar’, and you seem to be implying that they, when used together mean limitless, as in ‘no limit’, or dare I say ‘infinite’? Am I understanding you correctly?

Peter Zacharoff Not only does God know the choices we will make but He understands WHY we make the choices we do. This is because His understanding is limitless, beyond measure.
Peter Zacharoff In the Hebrew, Ayin means “no,” and micpar means “measure, number, for account” (W.E. Vine).

Gene William Steele So then it sort of means infinite? And we should take that pretty literally then?
Peter Zacharoff A paraphrase would say that “since His understanding is limitless, He knows everything.”

Gene William Steele So if when we find ‘ayin micpar’ in other places in the bible it means infinite, or just in this one verse in Psalms?

Gene William Steele In Genesis 41:49 the exact same words are used. Are you willing to state that they have the exact same meaning there also? Are we to say that the grain stored up was also ‘limitless’, or ‘infinite’?

Peter Zacharoff Grain has a physical property and is limited. The context here is an infinite God, not grain. The context determines the interpretation of any descriptor.

Gene William Steele So you already defined God, and then used your definition to tell you what the word means?

Peter Zacharoff Yes. To define God, we must systematically organize verses and produce a coherent ‘Theology Proper’ that is biblically consistent.

Gene William Steele But didn’t you just say that we can only understand this verse if we already have a certain theology in mind? Doesn’t that make this verse useless as an example of God knowledge if we have to have it defined before we even read it?

Peter Zacharoff In the case of the grain, the scope of measure might be humanly impractical to measure… unable to measure. So there is no contradiction as God is immeasurable, with no limit, infinite for our minds to understand. But His understanding is without “ayin” (no) measure.

Gene William Steele So you have one phrase, used in 2 different places, and you attribute different meanings because you have a preconceived idea of what God is like?

Peter Zacharoff This verse stands alone as to the infinite knowledge of God until it is challenged. Just as you used Genesis 41:49, other scriptures, focused on God, not grain, will corroborate Theology Proper regarding omniscience.

Peter Zacharoff Preconceived ideas about God are derived from a consistent systematic approach to Theology Proper.

Gene William Steele I gotta hit the hay. Nice talkin. Maybe we will do it again later.

Peter Zacharoff Our understanding is limited, so it is likely that we are not completely accurate when we try to place limits on God. (Job 11:7) “Can you discover the depths of God? Can you discover the limits of the Almighty?” No!