His opinion was probably much the same as that of St. Bernard. Before the definite decision of the Church was given theologians were free to discuss the matter. But the Church has since defined that the soul of Mary was never subject for a single moment to the stain of original sin. Both St. Bernard and St. Thomas would have been very glad to have had the assistance of such a definition.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty
