A time comes when meditation stirs the unconscious mind and brings forward hidden impressions. It quickens the method of analyzing, understanding, and surveying the unconscious.
One evening after my brother disciple and I had walked thirty miles in the mountains, we stopped to rest two miles beyond Kedarnath. I was very tired and soon fell asleep, but my sleep was restless because of my extreme fatigue. It was cold and I did not have a blanket to wrap around me, so I put my hands around my neck to keep warm. I rarely dream. I had dreamt only three or four times in my life, and all of my dreams had come true. That night I dreamt that the devil was choking my throat with strong hands. I felt as though I were suffocating. When my brother disciple saw my breath rhythm change and realized that I was experiencing considerable discomfort, he came to me and woke me up. I said, Somebody was choking my throat! Then he told me that my own hands were choking my throat. That which you call the devil is part of you. The myth of the devil and of evil is imposed on us by our ignorance. The human mind is a great wonder and magician. It can assume the form of both a devil and a divine being any time it wishes. It can be a great enemy or a great friend, creating either hell or heaven for us. There are many tendencies hidden in the unconscious mind which must be uncovered, faced, and transcended before one intends to tread the path of enlightenment.
When the senses are well-controlled and withdrawn from contact with the objects of the world, then sense perceptions no longer create images in the mind. The mind is then trained in one-pointedness. When the mind no longer recalls thought-patterns from the unconscious, a balanced state of mind leads to a higher state of consciousness. A perfect state of serenity established in sattva is the highest state of enlightenment. The practice of meditation and non-attachment are the two keynotes. A very firm conviction is essential for establishing a definite philosophy of life.
Careful vigilance and observation lead the student to study the incoming thoughts from the unconscious mind. The yogis recall all their samskaras, watch them, examine, and even select and reject them according to their need. Those thought patterns that are disturbing are rejected by the yogis, and those that are helpful are strengthened. A deep study of these three states-waking, dreaming, and sleeping-reveals that, with the help and practice of yoga nidra, one can go beyond all the levels of the unconscious.