The second cause of impurity in the understanding is the illusion of the senses and the intermiscence of the sense-mind in the thinking functions. No knowledge can be true knowledge which subjects itself to the senses or uses them otherwise than as first indices whose data have constantly to be corrected and over-passed...
Equally must the sense-mind be stilled and taught to leave the function of thought to the mind that judges and understands. When the understanding in us stands back from the action of the sense-mind and repels its intermiscence, the latter detaches itself from the understanding and can be watched in its separate action. It then reveals itself as a constantly swirling and eddying undercurrent of habitual concepts, associations, perceptions, desires without any real sequence, order or principle of light. It is a constant repetition in a circle unintelligent and unfruitful. Ordinarily the human understanding accepts this undercurrent and tries to reduce it to a partial order and sequence; but by so doing it becomes itself subject to it and partakes of that disorder, restlessness, unintelligent subjection to habit and blind purposeless repetition which makes the ordinary human reason a misleading, limited and even frivolous and futile instrument. There is nothing to be done with this fickle, restless, violent and disturbing factor but to get rid of it whether by detaching it and then reducing it to stillness or by giving a concentration and singleness to the thought by which it will of itself reject this alien and confusing element.
But here were worlds lifted half-way to heaven.
The Veil was there but not the Shadowy Wall;
In forms not too remote from human grasp
Some passion of the inviolate purity
Broke through, a ray of the original Bliss.