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.

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

The fact that psychology postulates an external material world and studies it in so far as it comes to be reflected in consciousness, points to another postulate which psychology must assume in addition, namely, the existence of an inner world consciousness.

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

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