It is not the heat which kills a person, but the acceptance of the heat. It is the same with food and medicine, for behind everything there is thought. Even now there are yogis who could jump into the fire and not be burnt. One will find that intolerant souls are the most unhappy in the world, because everything hurts them. Why should they be so -- uncomfortable in the house and restless outside? Because of this tendency of disliking, of rejecting, of prejudice. It is this tendency which must be conquered; and when it is conquered great mastery is achieved.