A relaxed way of being underneath thoughts, feelings and sensations that is peaceful and unaffected by external life conditions. This place is psychologically robust so that no matter how challenging life may get there remains an experience of peacefulness.
Well-being is seen as the natural progression of anyone who develops the capacity to watch their thoughts, still their mind and have the courage to face all their emotions. As you develop increasing objectivity and openness - a natural restfulness becomes increasingly more apparent.
Mindfulness is one way, along with its range of methods, is an effective way to assist you to access this peaceful way of being.