Here is Scripture's very first prophecy:
Genesis 3:15
And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.
If you were to interpret this prophecy using your maxim, what would the result be?
Would it be literal?
Or spiritual?
First off, seed of the woman has always been a reference to the Messiah. Seed is always of the man. But seed of the woman suggest something special. And that is where Isaiah comes in.... the Messiah would be born of a virgin.
Well, regarding the "thy seed", when compared with Daniel 2:43, a interesting picture emerges.
Daniel 2:43 (NKJV) As you saw iron mixed with ceramic clay,
they will mingle with the seed of men; but they will not adhere to one another, just as iron does not mix with clay.
Now, basic reading comprehension would suggest that if they are mingling with the seed of men, then they must be something other than the seed of men. Add to that Genesis 6 and things get interesting. Still just using the words as written, no twists and turns.
Genesis 6:2 (NKJV) that the sons of God saw the daughters of men, that they were beautiful; and they took wives for themselves of all whom they chose.
The Bene HaElohim (sons of God) in the OT is only used of Angels, starting with the oldest book of the Bible, Job. And that involves another hermeneutical principle.... the Law of First Mention. The Holy Spirit tends to use idioms in the same manner to mean similar things throughout scripture. Only when we get to the Messiah do we find that man can become a child of God thru Messiah.
The Daniel passage is in the section describing the world empires that will come. And the iron mixed with clay (seed mingling thing) is the last empire. So there must be some sort of mischief that characterizes the last days. Does genetic modification or Eugenics sound vaguely familiar? Moses didn't have those terms, but that is what was going on in Genesis 6.
And Yeshua said...
Matthew 24:37 (NKJV) But as the days of Noah were, so also will the coming of the Son of Man be.
And from Genesis 6, the main thing that characterized that time was the intermingling with human women by fallen angels, along with evil. In other words, seed other than the seed of men mixing with the seed of men. Just like Daniel stated would characterize the final days.
If it was only evil that brought the flood, well we have probably matched anything that was evil back then over the last 20 centuries. So there must be something specific, and Daniel, Moses, and Yeshua point us to what that is.
Now... you ask if the my interpretation would be literal or spiritual (allegorical), most definitely literal. Without even breaking a sweat, using the hermeneutic principle I mentioned. It would explain the false messiah and those that are aligned with him, all of which the Lord will destroy at His coming.