The aspirant is now fully equipped for the last lap of the journey. It is the toughest part of the pilgrimage to God. It is full of darkness and the aspirant has to pierce this darkness with his purified mind. The purified mind is the most dependable weapon in the armoury of the spiritual aspirant. The purified mind must be made to concentrate.
Concentration is mental focussing.
The mind can be focussed on a concrete object or an abstract idea. For a novice, concentration becomes easy if the object of concentration is concrete. Also, the beginner should choose a pleasing object on which to concentrate. Only thus can he prevent the mind from wandering away from the object of concentration. This should be followed by concentration on a suitable spiritual centre within the body.