Concentration can be explored as a function of mind, as an essential and distinct part of the path of liberation and as a "felt experience" in this very moment. Each exploration deepens understanding and empowers concentration.
While we may have guilt over an incident or a series of mishaps, shame is the accompanying attitude about oneself and can therefore be far more disruptive. Life becomes an uphill battle against our destructive inward narrative. Its variations go from feeling lesser and smaller than to being an obstacle and ultimately better off not existing. Confronting our conclusion around shame is taking on our emotional posture to life itself.