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

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

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

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

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

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

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