Whatever be the ideas suggested to crowds they can only exercise effective influence on condition that they assume a very absolute, uncompromising, and simple shape. They present themselves then in the guise of images, and are only accessible to the masses under this form. These image-like ideas are not connected by any logical bond of analogy or succession, and may take each other's place like the slides of a magic-lantern which the operator withdraws from the groove in which they were placed one above the other. This explains how it is that the most contradictory ideas may be seen to be
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