Tanya Chapter 29 part 3

To relieve the heart of numbness, the shell of the sitra achra -- the dark side -- must be shattered. In this exercise, a person is called upon to look at the misdeeds of their youth from their current standing. True, you've moved on. But there is a place deeper still that must be reached. And from this deeper space, you can bring yourself to a state of true humility, thereby allowing the light of the Divine soul to shine within your body and move your heart.