CCC 1857 says: 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.”
What constitutes “full knowledge”?
- Assume that I am a baptized Catholic.
- Assume that I know that the Church teaches that fornication is gravely sinful.
- Assume further that I simply do not believe that the Church’s teaching is true.
- Assume also my lack of belief is sincere, even if misguided.
- Finally, assume that, following my conscience, I with deliberate consent engage in acts that I know the Church says are gravely sinful.
Does my lack of belief (or perhaps a failure to appreciate the reasons for the prohibition against fornication) equate to lack of “full knowledge” so that I remain in a state of grace and have not committed a mortal sin?