- Can A Christian Sin And Be Lost?
 - Discusses the issue of eternal security. - Catholic Encyclopedia: Heresy
- Offers a definition of the sin. From the Catholic Encyclopedia.
- Catholic Encyclopedia: Sin
- Given in outline form, details the nature of, mortal, and venial sin, as well as permission and remedies.
- Religious Activities and Sin in One's Life
- Study guide featuring various scripture.
- Seven Deadly Sins (8)
- Learn about Seven Deadly Sins, the classification of vices used in early Christian teachings to educate and protect followers from sin. Sites feature overview of the seven sins, history, meanings of vices as expositioned by various saints, pop culture sources, and critical articles examining the seven vices as enumerated by Thomas Aquinas.
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