Science is the description of phenomena and the formulation of their relations.

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

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

The general tendency of evolution is from structure to function, from bondage to freedom of the individual elements.

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.

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.