what was the great yoga's instruction in it comes

to mind is discussed thing it concerns itself with thousands of different items at once things you are seeing around you think you are hearing and smelling things you are thinking about things you are trying not to think about

you must learn to concentrate your mind in such a way that you can visualize that will one item one item only and absolutely nothing else if you work harder than this you may be able to concentrate your conscious mind on anyone object you select for approximately three and one half minutes this will take around twenty years of diligent daily continual effort