Wilhelm Max Wundt,
An Introduction to Psychology
“ The name "mental science" has only the right to exist, so long as these departments of learning are based upon the facts of psychology—the mental science in the most general sense of the term. Now when would a historian, philologist, or jurist make use of any other means to understand some phenomenon or of any other arguments to prove some statement than those which spring from immediate facts of mental life? Why then should the standpoint of psychology be in absolute contradiction to the stand-points of its most nearly related sciences? ”
