Can venial sin become mortal sin?

[PDXSeeker_1975]

Examples might be allowing the mind to wander - even with “innocent” thoughts during Mass, or choosing not to pray, read scripture, attend Adoration,etc, when one could easily do so, and having no concern or effort to improve in these areas or otherwise deepen one’s relationship with Christ?
In reality, these attitudes probably WILL lead to worse sins. However, let’s say the sin never develops into anything more (the person follows the Church’s moral teachings, attends Sunday/Holy Day Mass, etc) but it keeps them from fully giving themselves to God as they should. Is there a point where that could reach the level of mortal sin for that person where they would be in danger of eternal damnation?

 

[Petaro]

If letting one’s mind wander during Mass ever becomes a mortal sin, there is hope for very few. A venial sin by its very definition can never become a mortal sin in itself. Slack attitude to our Christ and our devotions can lead to a sloppiness of mind that allows our standards to sink in other areas. Thus the rigid duty to devotion found in the Imitation of Christ by Thomas a Kempis.
A mortal sin requires a serious matter; full knowledge and deliberate intent.
Seek not to redefine, rather to avoid.