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

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 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.

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

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

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

The course of evolution is to a greater integration of similarly functioning ganglia.