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

The principle of recognition of evil under all its guises is at the basis of the true education of man.

The course of evolution is to a greater integration of similarly functioning ganglia.

Suggestibility varies as the amount of disaggregation, and inversely as the unification of consciousness.

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.

The fact that psychology postulates an external material world and studies it in so far as it comes to be reflected in consciousness, points to another postulate which psychology must assume in addition, namely, the existence of an inner world consciousness.