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

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.

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.

The recognition, the diagnosis, and the preservation of psychopathic individuals account for the apparent increase of neurotics in civilized communities.

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

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