You can tell how well you have managed [something] by remembering different important events from the past. If you recall memories that make you feel ashamed, or guilty, or angry, or hurt, and these memories are more than a year and a half old, then your mind is not at peace, and you are still carrying the weight of your past.

If something bad has happened to you, in the past, your mind cannot be at peace until you have figured out how to avoid having the same thing happen to you again in the future.