Snare,
Poor St. Thomas was stuck with a mind that fed on Aristotle and had to regurgitate it as theology.
He was caught in the crushing bind of having to accept a popular belief that even the Pope bought into: the Immaculate Conception of Mary
You know, that idea was not that Jesus was immaculately conceived (that's the Virgin Birth)--He had to swallow that Mary was sactified almost instantaneously after conception so as not to be born with original sin. Most Holy Mother of God.
There were many that held that she wasn't ever stained by "original sin"-- But Thomas' mind knew that ALL had sinned and needed redemption--that why Jesus had to be born and die, of course. So he had to reconcile the crazy idea that God could work a personal redemption before Jesus died?
Talk about a mind-%$#&!
If God could do that in the case of Mary--sort of erase the possibility of her being able to sin in the first place--I wonder why he didn't do the same for Adam and Eve?
Or, hell--why didn't he do it for everyone else?
At one point Thomas is said to have remarked of all his theological writings"It is all straw".
Personally, I think that is the truth.