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Well, it is a question of your conscience. When you have a well-formed conscience, you will notice many imperfections in what you do every day, in your thoughts, and sometimes in wrong thinking, which are not grievous or mortal sins. Sometimes we think things that are not good, or suddenly make judgments.
When we examine our conscience every day, we discover some imperfections, at least some omissions. For example, a lack of fervor or love for the Lord in our prayer, a lack of attention to our neighbor, or incautious words we speak. There are many such imperfections. They are not mortal sins, and sometimes not even directly venial sins, but they are still imperfections.
There is a difference between mortal sin, venial sin, and imperfections. We cannot always clearly establish the limit. Then we ask the Lord, go to Confession regularly, and it is sufficient even to confess one venial sin or one imperfection to receive the graces of the sacrament. This also helps to maintain a well-formed conscience, not leading to scruples, but fostering awareness and the desire to draw closer to the Lord. Frequent confession helps with this.