We are not our bodies

You should train yourself: Even though I may be sick in body, my mind will be free of sickness. That's how you should train yourself.... And how is one sick in body but not sick in mind? There is the case where an instructed noble disciple ... does not assume the body to be the self, or the self as possessing the body, or the body as in the self, or the self as in the body. He is not obsessed with the idea that "I am the body" or "The body is mine." As he is not obsessed with these ideas, his body changes and alters, but he does not fall into sorrow, lamentation, pain, distress, or despair over its change and alteration. (Similarly with feeling, perception, mental processes, and consciousness.) This is how one is sick in body but not sick in mind.