The Summa Contra Gentiles is not merely the only complete summary of
Christian doctrine that St. Thomas has written, but also a creative and
even revolutionary work of Christian apologetics composed at the precise
moment when Christian thought needed to be intellectually creative in
order to master and assimilate the intelligence and wisdom of the Greeks
and the Arabs. In the Summa Aquinas works to save and purify the
thought of the Greeks and the Arabs in the higher light of Christian
Revelation, confident that all that had been rational in the ancient
philosophers and their followers would become more rational within
Christianity. This exposition and defense of divine truth has two main
parts: the consideration of that truth that faith professes and reason
investigates, and the consideration of the truth that faith professes
and reason is not competent to investigate. The exposition of truths
accessible to natural reason occupies Aquinas in the first three books
of the Summa. His method is to bring forward demonstrative and
probable arguments, some of which are drawn from the philosophers, to
convince the skeptic. In the fourth book of the Summa St. Thomas
appeals to the authority of the Sacred Scripture for those divine truths
that surpass the capacity of reason. The present volume is the second
part of a treatise on the hierarchy of creation, the divine providence
over all things, and man's relation to God. Book 1 of the Summa deals
with God; Book 2, Creation; and Book 4, Salvation.