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

The fact that psychology postulates an external material world and studies it in so far as it comes to be reflected in consciousness, points to another postulate which psychology must assume in addition, namely, the existence of an inner world consciousness.

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

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

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

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

Superstitions, and especially the early cultivation of religion, with its "fear of the Lord" and of unknown mysterious agencies, are especially potent in the development of the instinct of fear. Even the early cultivation of morality and conscientiousness, with their fears of right and wrong, often causes psychoneurotic states in later life. Religious, social, and moral taboos and superstitions, associated with apprehension of threatening impending evil, based on the fear instinct, form the germs of psychopathic affections.