Erich Neumann
Author: Erich Neumann
Publisher: Princeton University Press (1954)

Even in its waking state our ego consciousness, which in any case forms only a segment of the total psyche, exhibits varying degrees of animation, ranging from reverie, partial attention, and a diffuse wakefulness to partial concentration upon something, intense concentration, and finally moments of general and extreme alertness.  The conscious system even of a healthy person is charged with libido only during certain periods of his life; in sleep it is practically or completely emptied of libido, and the degree of animation varies with age.  The margin of conscious alertness in modern man is relatively narrow, the intensity of his active performance is limited, and illness, strain, old age, and all psychic disturbances take their toll of this alertness.  It seems that the organ of consciousness is still at an early stage of development and relatively unstable.