In enumerating the factors capable of making an impression on the minds of crowds all mention of reason might be dispensed with, were it not necessary to point out the negative value of its influence.
We have already shown that crowds are not to be influenced by reasoning, and can only comprehend rough-and-ready associations of ideas. The orators who know how to make an impression upon them always appeal in consequence to their sentiments and never to their reason. The laws of logic have no action on crowds.[16]
To bring home conviction to crowds it is necessary first of all to thoroughly comprehend the sentiments by which they are animated, to pretend to share these sentiments, then to endeavour to modify them by calling up, by means of rudimentary associations, certain eminently suggestive notions, to be capable, if need be, of going back to the point of view from which a start was made, and, above all, to divine from instant to instant the sentiments to which one's discourse is giving birth.
This necessity of ceaselessly varying one's language in accordance with the effect produced at the moment of speaking deprives from the outset a prepared and studied harangue of all efficaciousness. In such a speech the orator follows his own line of thought, not that of his hearers, and from this fact alone his influence is annihilated.
[16] My first observations with regard to the art of impressing crowds and touching the slight assistance to be derived in this connection from the rules of logic date back to the seige of Paris, to the day when I saw conducted to the Louvre, where the Government was then sitting, Marshal V——, whom a furious crowd asserted they had surprised in the act of taking the plans of the fortifications to sell them to the Prussians.