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

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

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 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.

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.

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