Along with this affirmation, the Church of Rome (if less decisively) has adopted the limitations of the Thomist theory by the condemnation of " Ontologism "; certain mysterious doctrines are beyond reason.
The book is not what moderns (schooled unconsciously in post-Reformation developments of Thomist ideas) expect under the name of natural theology.
Deism is, in fact, the Thomist natural theology (more clearly distinguished from dogmatic theology than in the middle ages, alike by Protestants and by the post-Tridentine Church of Rome) now dissolving partnership with dogmatic and starting in business for itself.
Roman Catholic apologetics - of necessity, Thomist - is well represented by Professor Schanz of Tubingen.
This difficulty was presently raised by Duns Scotus and the realistically-inclined opponents of the Thomist doctrine.