Thomas Aquinas was undoubtedly the greatest of the medieval scholars, and The Summa was undoubtedly his greatest work. But it was never finished, and he refused to finish it, after he received a private revelation while celebrating Mass on December 6th 1273. He never elaborated on that experience, and he never wrote again. All he said was that all he had written now seemed like "straw."
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Why "straw"?
He was undoubtedly thinking of what St. Paul wrote to the Corinthians here.
According to the grace of God that is given to me, as a wise architect, I have laid the foundation; and another buildeth thereon. But let every man take heed how he buildeth thereupon. For other foundation no man can lay, but that which is laid; which is Christ Jesus. Now if any man build upon this foundation, gold, silver, precious stones, wood, hay, stubble: Every man's work shall be manifest; for the day of the Lord shall declare it, because it shall be revealed in fire; and the fire shall try every man's work, of what sort it is. If any man's work abide, which he hath built thereupon, he shall receive a reward. If any man's work burn, he shall suffer loss; but he himself shall be saved, yet so as by fire.
1 Corinthians 3:10-15 (Douay Rheims Translation.)
So if the greatest scholar of the Scholastic era saw his greatest work as a work of "straw," what does that say about scholasticism?