As sinners we should keep in mind that our root problem is not that we are people who commit this or that sin, but that we are squanderers of grace. Sin, after all, considered as evil, is the privation of the good or virtue that ought to be there instead. That is why there is nothing delightful or even interesting about sin; when there seems to be it is because we have been deluded or tricked by worldly distraction, concupiscence, or the devil.
We believe in a just God, a God who is Justice, and one of the primary expression of God's justice in our lives is to supply with us with all of the particular grace we might require to live the life to which we have been called with freedom and joy. My yoke is easy, and my burden light. So if we sin, it is because we have missed out on the grace that is offered to live the opposite virtue or to do the opposite work.
This is why vigilance and attention are so critical, to leave our minds and senses free enough to notice and take advantage of the graces that come to us in the course of our days.
Penance: the old 10, 10, and 10.