The concluding three lessons of this series will be devoted to a practical course of instruction in the development of the hidden planes of the mind, or rather, in the development of the power of the individual to master the same and make use of them in his life. He will be taught to master the lower principles, not only in the surmounting of them, but in the transmitting of the elemental forces toward his higher ends. Power may be obtained from this part of the mind, under the direction of the Will. And the student will be told how to set the unconscious Intellect to work for him. And he will be told how to develop and train the Will. We have now passed the line between the theoretical and the practical phases of the subject, and from now on it will be a case of train, develop, cultivate and apply. Knowing what lies back of it all, the student is now prepared to receive the instructions which he might have misused before. Peace be with thee all. MANTRAM (AFFIRMATION). I AM THE MASTER OF MY SOUL. THE TENTH LESSON. SUB-CONSCIOUSING. In the Ninth Lesson we called your attention to the fact that Reasoning was not necessarily conscious in its operations, and that, in fact, a large part of the rational processes of the mind are performed below or above the field of consciousness. And in the Eighth Lesson we gave you a number of examples illustrating this fact. We also gave you a number of cases in which the sub-conscious field of the Intellect worked out problems, and then after a time passed on to the conscious field of the Intellect the solution of the matter. In this lesson we purpose instructing you in the methods by which this part of the Intellect may be set to work for you. Many have stumbled upon bits of this truth for themselves, and, in fact, the majority of successful men and men who have attained eminence in any walk of life have made more or less use of this truth, although they seldom understand the reason of it. Very few Western writers have recognized the work of this plane of the mind. They have given us full and ingenious theories and examples of the workings of the Instinctive Mind, and in some cases they have touched upon the workings and operations of the Intuitional planes, but in nearly every case they have treated the Intellect as something entirely confined to the Conscious plane of mentation. In this they have missed some of the most interesting and valuable manifestations of sub-conscious mentation. In this lesson we will take up this particular phase of mentation, and trust to be able to point out the way to use it to the best advantage, giving some simple instructions that have been given by the Hindu teachers to their students for centuries past, such instructions of course, being modified by us to conform to the requirements and necessities of the Western student of today.