When we sin, we usually don’t do things that we know are clearly wrong. Instead, we often do things that we that we feel are “gray” areas; things we can easily justify. Why?
The devil knows if he attacks us directly and tries us to do something we have clear morals against, we will resist him and we will run to God. So he attacks us where we are the weakest, slowly moving us away from God in very subtle ways.
However, there is a quick and easy way undo any damage these attacks cause. Each day for even from a moment, ask God to forgive you for those errors in judgement and to help you love him more each day.