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

Social laughter is momentary, soon burns itself out and passes away like the fire and smokes of straw, but genius shakes the very skies with its lasting, inextinguishable laughter.

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.

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

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

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