I think first in Understanding this is the term "Godhead".  This has always seemed very simple to me, despite the many fools out there who say, "Do you worship one God, or three?"  Step one, God is God.  He made the world's most efficient motor in the tail of a microbe, and He made blast furnaces called stars thousands of times bigger than our planet.  Whatever we understand, it is small compared to the totality of Him.  Step two, we were made "in our image, after our likeness" (Gen. 1:26).  Step three, WE have a mind that guides and commands, a body that does, a soul that inspires- just so, God is Father In Command, Son who does, Spirit that inspires. The mechanics of that in ourselves is largely a mystery, do you think we can dial God all the way in?  Whether there is a Father/Son relationship as WE know them, or it's a fleshly term used so that we might have a tiny grasp on things, God knows, but it is enough.

Next, I noticed something in the word translated in KJV as Understanding.  When used in the idea of Jesus-as-understanding, it is this:

בּינה bı̂ynâh (bee-naw')

From H995; understanding: - knowledge, meaning, X perfectly, understanding, wisdom.

Which is what I spent time on last week.  However, understanding as grasping a concept uses that other word mentioned:

בּין bı̂yn (bene)

A primitive root; to separate mentally (or distinguish), that is, (generally) understand: - attend, consider, be cunning, diligently, direct, discern, eloquent, feel, inform, instruct, have intelligence, know, look well to, mark, perceive, be prudent, regard, (can) skill (-ful), teach, think, (cause, make to, get, give, have) understand (-ing), view, (deal) wise (-ly, man).