Truth must be the starting point of any definition in medicine and therefore in medical ethics. The space-time definition of the human body and the continuity of the process in it is the first obstacle in medicine on the path to truth, and we immediately encounter this when we try to determine the state of health of patients. The second obstacle lies in the very definition of the concepts of health and disease, which in the end mutually define each other. The desire to penetrate into the continuity of processes in the body is in fact the desire for absolute truth. That which provides existence has an insider (internal, representative) approach to truth. The need to have complete control over the truth in medicine must sometimes end in faith or self-evidence. Philosophy accepted this a long time ago and for the sake of ethics, in the light of a scientific approach to medicine, it is necessary to constantly revise our views.