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 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.

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

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

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

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