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

Psychology is the science of psychic states both as to content and form, regarded from an objective standpoint, and brought in relation to the living corporeal individual.

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.

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

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.

The man of genius whether as artist or thinker requires a mass of accidental variations to select from and a rigidly selective process of attention.