In his “Fundamentals of affectivity, emotions in the healthy and sick” the author brings a general representation of the nature of emotions, their biological origin and phenomena of expression than their primitive somatic forms as pain, hunger, thirst, etc., up to psychic conditions as joy and sadness. Special attention is paid to the subjective feelings of being sick in the physically ill as this should not only be of theoretical but also of practical interest for the practicing physician. The author stresses the importance to never overlook the unity of body and “soul”