It is not easy to deceive oneself intentionally but it is possible to do so if you know how to do.
|However, the delusion is not easily established. Unless one deceives oneself as if it is real and believes the delusion, the fantasy won’t be able to exist.|
Therefore, the Rounds held an elaborate ceremony to deceive themselves.
It must be looked like as if it was a pursuit of objective truth (otherwise they cannot believe it), and the conclusion (=fantasy) of that "Nousos are evil and Rounds are good" must be fixed beforehand. As the conclusion is decided in advance, it is impossible to pursue an objective truth. But if it does not look like a quest for an objective reality, it is impossible to deceive themselves.