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Knowledge Is Necessary for Venial Sin

Question:

Do you have to have knowledge to commit a venial sin?

Answer:

Yes, some knowledge is necessary for a venial sin to be committed. The Catechism of the Catholic Church states:

One commits venial sin when, in a less serious matter, he does not observe the standard prescribed by the moral law, or when he disobeys the moral law in a grave matter, but without full knowledge or without complete consent (CCC 1862).

For the sin to be mortal, full knowledge is required:

For a sin to be mortal, three conditions must together be met: Mortal sin is sin whose object is grave matter and which is also committed with full knowledge and deliberate consent (CCC 1857).

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