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.

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

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

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

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

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