The original Upper Paleolithic people would, if they appeared among us today, be called Caucasoid, in the sense that they lacked the particular traits we associate with Negroid and Mongoloid types.

A taxonomy of abilities, like a taxonomy anywhere else in science, is apt to strike a certain type of impatient student as a gratuitous orgy of pedantry. Doubtless, compulsions to intellectual tidiness express themselves prematurely at times, and excessively at others, but a good descriptive taxonomy, as Darwin found in developing his theory, and as Newton found in the work of Kepler, is the mother of laws and theories.

The only immortality we know of is our children, and in that unfinished story of the acts of lives, which, forever expanding, like waves from a pebble in the lake, have their immortality in the acts of future generations.

But psychology is a more tricky field, in which even outstanding authorities have been known to run in circles, 'describing things which everyone knows in language which no one understands'.

[I] browsed far outside science in my reading and attended public lectures - Bertrand Russell, H. G. Wells, Huxley, and Shaw being my favorite speakers.

Intelligence is important in psychology for two reasons. First, it is one of the most scientifically developed corners of the subject, giving the student as complete a view as is possible anywhere of the way scientific method can be applied to psychological problems. Secondly, it is of immense practical importance, educationally, socially, and in regard to physiology and genetics.

Plato compared the intellect to a charioteer guiding the powerful horses of the passions, i.e., he gave it both the power of perception and the power of control.