Here the art of propaganda consists in putting a matter so clearly and forcibly before the minds of the people as to create a general conviction regarding the reality of a certain fact, the necessity of certain things and the just character of something that is essential. But as this art is not an end in itself and because its purpose must be exactly that of the advertisement poster, to attract the attention of the masses and not by any means to dispense individual instructions to those who already have an educated opinion on things or who wish to form such an opinion on grounds of objective study--because that is not the purpose of propaganda, it must appeal to the feelings of the public rather than to their reasoning powers.