When we realize what may be accomplished - p.19
WHEN we realize what may be accomplished through concentration, we shall make every conceivable effort to develop this master art; and our persistence, determination and enthusiasm will know neither pause nor measure; we will purpose positively to learn how to concentrate, and therefore will want to know how to proceed --- what principles to adopt and what methods to apply.
When we examine the psychology of concentration, we find that it is based upon mental actions that are deeply interested in a certain subject or object; that is, we concentrate naturally and without effort whenever or wherever we are vitally interested. This then is the first principle. Be really interested in