"Urusvati knows that all yogas demand profound discipline. This should be stressed, because some people think that there are yogas that do not require strictly disciplined conduct. They believe that some yogas are more difficult than others, and dream about following the easiest. But all require the same degree of inner discipline. For the yogi, there must be a great degree of tension of the psychic energy, because it builds an immunity that is so needed during the opening of the centers. The yogi has been compared to a person with flayed skin. This is a crude analogy, but not without truth. If the yogi did not develop immunity, he would not be able to endure the contact with the spatial currents. Urusvati knows that certain currents cause painful scraping and prickly sensations. One can imagine what might happen without the building of immunity! Some will be sure to smile when We say that the main factor in the acquiring of immunity is a good thought. But one cannot become a yogi without acknowledging the power of good thoughts. Such thoughts are the best gatekeepers at the entrance to the Subtle World. So many people imagine themselves to be yogis, yet they are filled with malice! People assume that they will experience a sudden enlightenment that will by its own power carry them over all obstacles... 559."