Contra Gentiles, Vol. 3

The Summa Contra Gentiles is in the unique position of a classic, of which the author's manuscript is still in great part extant. It currently resides in the Vatican Library.
There are two ways of behaving towards Thomas' writings, analogous to several treatments of a church still standing in which the saint might have worshiped. One way is to hand the edifice over to some Society for the Preservation of Ancient Monuments; they will keep it locked to the vulgar, while admitting some occasional connoisseur: they will do their utmost to preserve every stone identically the same that the medieval builder laid.

This is effort is the Complete Work, Summa Contra-Gentiles, literally translated by The English Dominican Fathers from the latest “Leonine Edition.”