Concentration is the key to such development.  Concentration has been fully explained in Lesson No. 1.  By the constant exercise of concentration, objectively and subjectively, in your daily life you will in a short time become conscious of growing Strength.  The exercises I give you in this lesson on Self-Control, Will-Culture and Memory-Culture if gone through with perseverance will further develop Concentrative ability.  In fact, this entire series of lessons will call for Effort and Concentration.  “Rome was not built in a day”—­nor can you achieve real greatness in a few months.  No.  All I can do is to indicate the line and the nature of the effort required of you and if clearly followed, Progress and Growth will commence from the first day.  In connection with this, a little digression would be necessary.  The Occultist says:  Nature, unaided, fails.  The purposiveness of Deity, manifesting in nature an evolution, is present in all individual centres but it has the way to full expression opened out to itself only when the more evolved centres of life consciously cooperate with it.  Evolution is started and carried only by the creation of centres within the GREAT CONSCIOUSNESS and by preserving and enlarging or expanding these centres.  So long as the race had not reached “SELF-CONSCIOUSNESS” (see Yoga Lessons) the sub-conscious forces of nature had entire control over evolutionary processes, but this stage was reached by the race according to the LAW OF AVERAGES in the seventeenth century and you are now expected to take your progress in your hands and consciously direct your inner forces along such lines as best correspond to the stage of your growth.  So independent study and steady thinking form the secrets of a keen and broad intelligence.  You will always find that the man who is more powerful than yourself and moves you at his will has an intelligence and understanding far superior to yours and he can read your whole nature as he would an open book, although you find him quite beyond your depth.  Learn to regard earnestly the workings of different mentalities around you.  Become a student of human nature.  To you, each man ought to be only a partial expression of his mind.  Examine closely into the motives acting behind each personality.  Learn to respond more quickly to the Thoughts and Feelings of a man than to his outer speech and action.  The latter are objective expressions of the subjective self.  The study of Phrenology and Physiognomy are good things to start with in your efforts to acquire knowledge of human nature. Mind is One and at the same time, Many.  Subjectively, it is ONE.  Objectively; many.  So by looking impartially into “yourself” in the calm light of the intellect and through silent introspection, you will always find a clue to the working bases of other minds.  Each man is a puzzle and most of all are YOU a puzzle unto yourself.  Solve either and you have solved both.  “MAN, KNOW THYSELF.”