By meditation Atisha never means concentration, remember. Concentration and meditation are polar opposites. Concentration narrows down your mind; it is focusing on one point. It includes only something and excludes everything else. Meditation is all-inclusive, it excludes nothing. It is not a narrowing down of the mind, it is an expansion of consciousness. Concentration is of the mind, meditation is of consciousness. Concentration is mind, meditation is no-mind. Concentration is a tension: you will be tired of it sooner or later. You cannot concentrate for a long time, it is effort. But one can be meditative twenty-four hours, because it is relaxation.