Let’s rephrase that so you can understand why you’re having trouble answering it:
“What causes an uncaused cause to be rational?”
The question is inherently contradictory. If He is uncaused, NOTHING would cause Him to be rational, just as nothing caused Him to exist.
We only know naturally He is rational because we see his handiwork. Since He is beyond our wildest imaginings and our greatest intellect, we can’t comprehend this Being who simply exists…
If the First Cause is Uncaused, nothing causes him to be rational, nor to create.
If he is Actual and unmoved then he never “moves” but is complete.
If there is a creation, a universe, created by this being, it is not a “new action” or new actuality of the Causer.
In an intelligible world, where all things can be understood by an intellect, cause works to an end, to a goal, to a result. A heavy body in motion is on a course to somewhere in its line of motion, and if it bumps a small body on a different line of motion, the light body is deflected - the goal? or end? The heavy body continues in a slightly altered line of motion to a slightly altered new goal, the new goal caused by the light body. The light body moves in a greatly altered line of motion to a new goal, the new end caused by the heavy body.
We understand this in virtue of our intellect, which is provided with observation of material reality by our senses. With our intellect we also understand that we are able to intelligently cause things to have a pre-planned goal.
If the First Causer does not change, does nothing new or different than before (something would be caused in the first cause if there were change), then without intellect, those things caused by the first causer would be “eternal” and “repeated”. “Creations” would be popping up in infinite succession. But the creations popping up would have repeatedly random content with no guarantee that they would not disintegrate in the next moment - we observe that there are laws of nature, but there is no guarantee that the laws of nature will not change in the next moment. If there were only “one creation” by the First Cause, then the First Cause would be changeable, and therefore caused, because it would be creating, but then change into not-creating, which would therefore not be the logical First Cause.
If the First Cause is intellect, intellectual, then his eternal reality is knowing, and only that, knowing all in completeness, his knowing never changing. With this knowing it is possible to know, to understand, some “object” that is not him. From always he could know something that is not always. And if he knows it, then at some “point” not always begins, is created, just as he knows it from always. What he knows as “not always” is intelligible because he knows it. It exists, comes into being, when “not always” begins because he knows it being. And it has an end, a goal, of being what he knows just as he knows it.
He has not changed, not done something new by creating, not had a new movement (so he himself is not caused nor does he cause himself to move). A non-intelligent first cause would have to, as said, constantly be duplicating causation, yet without any reasonable goal.
How does that sound?
John Martin
SoftVocation.org