It is a borderland where all the worlds meet, mental, vital, subtle physical, pseudo-spiritual — but there is no order or firm foot-hold — a passage between the physical and the true spiritual realms.
A zone of transition between the ordinary consciousness in mind and the true yoga knowledge. One may cross without hurt through it, perceiving at once or at an early stage its real nature and refusing to be detained by its half-lights and tempting but imperfect and often mixed and misleading experiences; one may go astray in it, follow false voices and mendacious guidance, and that ends in a spiritual disaster; or one may take up one’s abode in this intermediate zone, care to go no further and build there some half-truth which one takes for the whole truth or become the instrument of the powers of these transitional planes, — that is what happens to many sadhaks and yogis. Overwhelmed by the first rush and sense of power of a supernormal condition, they get dazzled with a little light which seems to them a tremendous illumination or a touch of force which they mistake for the full Divine Force or at least a very great yoga Shakti; or they accept some intermediate Power (not always a Power of the Divine) as the Supreme and an intermediate consciousness as the supreme realisation.
Those galloping hooves in their enthusiast speed
Could bear to a dangerous intermediate zone
Where Death walks wearing a robe of deathless Life.
Or they enter the valley of the wandering Gleam
Whence, captives or victims of the specious Ray,
Souls trapped in that region never can escape.