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.

Science is the description of phenomena and the formulation of their relations.

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

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.

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.