Here it is again:
fordham.edu/halsall/basis/aquinas-eternity.asp I find nothing in St. Thomas’s article that indicates a faithful Catholic can’t affirm a created eternal universe. Perhaps you will and can correct me. Thank you.
First of all let’s begin by stating categorically that a Catholic must hold and believe that " All that exists outside God was, in its whole substance, produced out of nothing by God. ( De fide, Vatican Council 1 )
Secondly, all Catholics must believe and hold that " …The world had a beginning in time.(De fide , Both the 4th Lateran Council, 1215 and the Vatican Council 1 declared that " …together, in the beginning of time God ] founded out of nothing the double order of creatures, spiritual and corporal…"
So no Catholic, in good standing, can hold that the world always existed. They must hold, with the Church, that there was a moment before which, the universe did not exist in any form; before which, there was no physical matter of any kind - no matter how subtlely it may be imagined or defined; that there was a moment before which, nothing existed except God.
And Thomas did not teach anything else. Unfortunately the link you gave does not allow one to see the entire piece in context.
But it sounds much like what Thomas is discussing in S.T., Part 1, Ques 46. There he makes it absolutely clear what Catholics believe, what he believes. But his main object is to show that even if the world had always existed, from a philosophical point of view, it could only have done so if God had been eternally creating it. He wanted to make that point because even if one held, like the Greeks, that the world had always existed, one would still have to believe in God or one could not say that an eternal world ( as some proposed today ) was self sufficient and did not require a God creator.
That is about all I can say. Linus2nd