In ecology one is beginning to discover these things, and supposing if you allowed, well, I'll give you an example: There was a leper colony and the rats were eating the feet of the lepers, and nobody could sleep because the rats would just walk over your bed, and they weren't even afraid of a stick. It was because they killed the cobras. Then the doctor who was running this home made a covenant with the cobras, and the cobras increased and the rats decreased. It is a case of the balance of ecology in the world, and people are discovering more about it nowadays. So we need certain parasites. We call them parasites, maybe in our body, like germs that are good and others that are not. Perhaps there is a balance between them, or perhaps there are too many. I spoke to you of that man who was controlling all these monsters. Well, the human will has the ability to control the minds of these beings. If you can do it you can heal yourself. And you can heal others. It takes a lot of power, of course. As we said before, the whole purpose of life is mastery. You have to become a master of all conditions.