Georges Canguilhem’s philosophy of life, according to which the living is a normative subject, grounds its epistemology in medicine. Medicine is a technique or an art that aims to restore the individual normativity of the patient. It can only be practiced based on the knowledge and understanding of the life norms, and on experience and values, in other words, on the subjectivity. This explains why the clinic and the therapeutics require a personal relationship between the physician and the patient.