Concentration...may be defined as - p.9
CONCENTRATION in general may be defined as an active state of mind wherein the whole of attention, with all available energy and talent, is being applied upon the one thing that we are doing now. We concentrate in the full meaning of the term when we give ourselves completely to the thought or the action of the present moment; and this is true whether we work with muscle, brain or mind, or express ourselves through thoughts, words or emotion.
The principle of concentration is to do one thing at a time, and to do that one thing with all the talent and power , we possess. We literally turn on the full current of mental and personal energy --- not only the full current of what