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Internet Resources on Christian Asceticism: http://www.ellopos.net/notebook/resources_f.htm
Christian Classics Ethereal Library: 
 http://www.ccel.org/ 
Extremely helpful source of primary texts in 
church history, Christian spirituality, Christian music, and more
Lectio Divina: Christian Spiritual Authors:
http://www.osb.org/lectio/ 
Index page of sources for spiritual reading; 
many good primary texts in early Christian theology and spirituality.
The Ecole 
Initiative: 
http://www2.evansville.edu/ecoleweb/ 
“A Hypertext Encyclopedia of Early Church History” (and primary texts)
New Advent: 
http://www.newadvent.org 
Patristic Texts, The 1908 Catholic Encyclopedia, Hagiography
The Holy See: 
http://www.vatican.va/phome_en.htm
Official Website of the Holy See: papal and curial documents in different 
languages.
Ignatian 
Spirituality: 
http://www.jesuit.org/sections/sub.asp?SECTION_ID=192&SUBSECTION_ID=207 
 
The Spiritual Exercises, St. Ignatius, Ignatian spirituality, and more.
Christus Rex: 
http://www.christusrex.org/ 
Christian Art, The Holy Land, Papal Documents
Jordan Aumann, O.P. Articles and complete books, including Spiritual Theology and Christian Spirituality in the Catholic Tradition: http://www.domcentral.org/study/aumann/default.htm
Adolphe Tanquerey, S.S., Articles § 1-899 of a classical text, used for several decades as the basic textbook of ascetical/mystical theology in Roman Catholic seminaries: The Spiritual Life, A Treatise On Ascetical And Mystical Theology