Summa contra Gentiles
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The Summa contra Gentiles (also known as Liber de veritate catholicae fidei contra errores infidelium, "Book on the truth of the Catholic faith against the errors of the unbelievers") is one of the best-known treatises by
It was probably written to aid missionaries in explaining the
The conventional title Summa contra Gentiles, found in some of the earliest manuscripts, is sometimes given in the variant Summa contra Gentes. The title is taken from chapter I.2, where Thomas states his intention as the work's author:
I have set myself the task of making known, as far as my limited powers will allow, the truth that the Catholic faith professes, and of setting aside the errors that are opposed to it. To use the words of
Hilary: 'I am aware that I owe this to God as the chief duty of my life, that my every word and sense may speak of Him' (De Trinitate I, 37).
A longer title is also given as Tractatus de fide catholica, contra Gentiles (or: contra errores infidelium), meaning "Tractate on the