What, for example, should we say of a poster which purported to advertise some new brand of soap by insisting on the excellent qualities of the competitive brands? We should naturally shake our heads. And it ought to be just the same in a similar kind of political advertisement. The aim of propaganda is not to try to pass judgment on conflicting rights, giving each its due, but exclusively to emphasize the right which we are asserting. Propaganda must not investigate the truth objectively and, in so far as it is favourable to the other side, present it according to the theoretical rules of justice; yet it must present only that aspect of the truth which is favourable to its own side.