In his approach to the history of psychology, E. G. Boring (1886–1968) stressed the importance of the Zeitgeist in determining whether, or to what extent, an idea or viewpoint will be accepted. Clearly, ideas do not occur in a vacuum. A new idea, to be accepted or even considered, must be compatible with existing ideas. In other words, a new idea will be tolerated only if it arises within an environment that can assimilate it.
p. 4 - An Introduction to the History of Psychology, 2008