The region of true thought is the causal plane, that is, the higher mental plane, and the further thought strays from these heights, the more it is obstructed and diverted.
Yet, in order to face all the problems of everyday life with which human beings are confronted, their thought is forced to descend and clothe itself in thick, coarse garments.
Dressed this way, thought becomes unrecognizable and loses its power.
Thought is all-powerful on high. Once it descends to the level of the intellect (the lower mental plane) and the heart (the astral plane), it gets covered in grime, and as it is no longer as pure, it loses almost all its penetrative strength.
If you want your thought to regain its true power, its ability to meditate and to unite you with heaven, you must rise up to the causal plane.