The same law applicable to material work can be applied to spiritual work. Concentration is the main thing and, when concentration is not attained, whatever a person will do will not bring about worthwhile results. In all different occupations the cause of failures in ninety-nine among a hundred cases is lack of concentration. When a student falls in his examination, when a businessman falls in making a real success, when an industrialist fails to bring about success, in all these cases it is lack of concentration which causes the failure.