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

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

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

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

Self-preservation is the central aim of all life-activities.

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

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