If you know the name of a saint you are interested in you probably can find an article on that saint at
http://en.wikipedia.orgSuch an article will usually have bibliographies of writings of that saint and links to free online books by that saint if any exist.
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Portal:Saints
From Wikipedia, the free encyclopedia
The Saints Portal
Isidore of Seville
A saint is a particularly good or holy person, whose life and actions are considered inspirational. The term is used within Christianity, with definitions varying by denomination. English-language publications will sometimes use saint to describe a revered person from another religion. The word itself means “holy” and is derived from the Latin sanctus. During periods of Christianity, many people have prayed to saints as intercessors, and communities developed strong rituals around particular saints, adopting one or more as patron saints of a locale or occupation.
In Christianity, the concept arose in early Greek Christian literature with the use of the word hagios (Greek άγιος meaning “holy” or "holy one") and in the New Testament, where it was used to describe the followers of Jesus of Nazareth. (In the Old Testament, the cognate is the Hebrew word qodesh, קדש)
http://en.wikipedia.org/wiki/Portal:SaintsQuote:
List of saints
From Wikipedia, the free encyclopedia
This article is about Christian saints. ...
This is an incomplete list of Christian saints in alphabetical order by Christian name, but if necessary by surname, the place or attribute part of name as well.
There are more than 10,000 Roman Catholic saints and beatified people. Among the Eastern Orthodox and Oriental Orthodox Communions, the numbers may be even higher, since there is no fixed process of "canonization" and each individual jurisdiction within the two Orthodox communions independently maintains parallel lists of saints that have only partial overlap.
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http://en.wikipedia.org/wiki/List_of_saints