This is also known as Christian mysticism and can only work once the paradigm of thought is been shifted to only include "the unmoved mover". The reason for this is of course that it is "argument from ignorance". When in doubt insert God, since it's the default faith. This was just as much a logical fallacy in Aquinas day as it is now. Today we say "God of gaps" and smirk a bit when ever it's brought up.
We can't say anything about something beyond our imagination. It effectively prevents us from having faith in it. We can't take a leap of faith if we don't know to where were leaping. It also makes it impossible for us to deduce God's perfection.
That's the thing I love about Aquinas. He spent his whole life dedicated to proving Gods existence and all he did was to prove that it rests on circular argumentation from the lack of evidence.
I love religion.