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.

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

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.

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

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

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

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