Tanya Chapter 29 part 4

Walking down the path to humility, we are enjoined to examine our thoughts, utterances and deeds. Were all of them an expression of holiness, allowing us to be a vehicle of the holy chambers? Or did some of our behaviors cause us to act as a chariot for the chambers of impurity? This is a most humbling thought. And further, let us consider our dreams: Did we experience mundane dreams, or even tormenting ones? This would point to the fact that those originating from the evil side come and attach themselves to the person. These humbling thoughts shatter the darkness that numbs our heart and obscures the Divine light from affecting our heart.