Social laughter is momentary, soon burns itself out and passes away like the fire and smokes of straw, but genius shakes the very skies with its lasting, inextinguishable laughter.

If society is to progress on a truly humanistic basis, without being subject to mental epidemics and virulent social diseases to which the subconscious falls an easy victim, the personal consciousness of every individual should be cultivated to the highest degree possible.

Human institutions depend for their existence and stability on the impulse of self-preservation and its close associate, - the fear instinct.

The main source of psychopathic diseases is the fundamental instinct of fear with its manifestations, the feeling of anxiety, anguish, and worry.

Not purpose but chance is at the heart of mental life.

Psychology must postulate uniformity of interrelation of physical, physiological, and psychic processes.

The psycho-physiological hypothesis is both inductively and deductively the sine qua non of the science of psychology.