"Psychology must not only strive to become a useful basis for the other mental sciences, but it must also turn again and again to the historical sciences, in order to obtain an understanding for the more highly developed metal processes."

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Ready made opinions can be distributed day by day through the press, radio, and so on, again and again, till they reach the nerve cell and implant a fixed pattern in the brain. Consequently, guided public opinion is the result, according to Pavlovian theoreticians, of good propaganda technique, and the polls [are] a verification of the temporary successful action of the Pavlovian machinations on the mind.

— Joost Meerloo