I spoke yesterday about this rishi who sits in the snow. Of course it is no use for you to go out and sit on the ground all night if you haven't got yourself used to it. If you can gradually strengthen yourself you will have the strength to be able to withstand conditions which you would be surprised that you are ever able to do; and it is because of our weakening of our resistance that we are ill. We blame it on microbes, but if we are strong enough we can overcome the germs and microbes.