"The preparation for active rook play entails what is called the opening of lines, which largely depends on pawn play, especially on the proper use of levers."

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Propaganda tries first of all to create conditioned reflexes in the individual so that certain words, signs, or symbols, even certain persons or facts, provoke unfailing reactions...The important thing is that when the time is ripe, the individual can be thrown into action by the utilization of the psychological levers that have been set up.

— Jacques Ellul