In sections IV and V, Freud posits that the process of creating living cells binds energy and creates an imbalance. It is the pressure of matter to return to its original state which gives cells their quality of living. The process is analogous to the creation and exhaustion of a battery. This pressure for molecular diffusion can be called a "death-wish". The compulsion of the matter in cells to return to a diffuse, inanimate state extends to the whole living organism. Thus, the psychological death-wish is a manifestation of an underlying physical compulsion present in every cell.