Today is the feast of St. Frances of Rome who lived during the Great Western Schism (1378-1417) when there were two competing clerics claiming to be pope. Frances was a wife and mother, married at thirteen to a good man who never tried to curb her austerities and service to the poor. She was charming and kind and well loved, especially by the poor.
One of the amazing things about St. Frances were her visions and mystical experiences. They included being escorted through hell and seeing the punishments inflicted on those who broke the commandments.
The Bible tells us that fear of the Lord is the beginning of wisdom and reading her words and the descriptions of her visions will certainly immerse you in the fear of the Lord! It's better to serve God out of great love for Him than out of fear, of course, but often that begins with recognizing his power and judgment of sin. And don't we acknowledge that when we pray the act of contrition?