If we have deliberately committed a venial sin, and we don’t mention it in confession, does that affect the validity of the sacrament?
What if the venial sin is directly connected to mortal sin?
For example, someone tells a lie in order to commit a serious sin. The deliberate lie itself might be venial (“I’m going straight home after work” when actually he/she drives to a lover’s house); but the reason is grave (to commit adultery).
If the deliberate lie is not confessed, but the adultery is, does that affect the validity of the confession?
Another consequent question: Does a venial sin become grave matter if it is committed with the intention of committing a mortal sin?
(Note: this is a hypothetical question, and not a personal confession)