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

The tendency of life is not the preservation of the species, but solely the preservation of each individual organism, as long as it is in existence at all, and is able to carry on its life processes.

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

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

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

Mental synthesis of psychic content in the unity of a moment-consciousness is a fundamental principle of psychology.

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