As you point out, though, even the title “Doctor of the Church” does not imply that all their writings are doctrinally correct.
[quote=Psalm90]There was some saint who was against the idea of Mary’s immaculate conception, for example; I think that was St. Thomas Aquinas.In his day, that was not considered a settled matter.
[quote=Blue Horizon]However even [Thomas Aquinas] got one or two things not quite right (eg he jumped the wrong way on the Immaculate Conception - but then it wasn’t clear to anyone I n his time).
It’s a good point that doctrine is considered ‘settled’ at a particular point in time, and therefore, if a saint lived before that time, then we wouldn’t expect him or her to have expounded on the doctrine in a way that anticipates the future expression of the doctrine. In fact, some have expressed ideas that don’t fully agree with later doctrine.
In the case of Aquinas and the Immaculate Conception, his problem was less with love of Mary than it was a mistaken idea about the biology of human reproduction. Since he got the biology wrong, he couldn’t see through to understanding how the IC was possible. :shrug: