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

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

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 man of genius whether as artist or thinker requires a mass of accidental variations to select from and a rigidly selective process of attention.

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

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