Experience creates the most stubborn form of prejudice: postjudice.

Prejudice, the act of judging without experience, based on hearsay and conditioning and projection towards the individual, instead of careful examination, is clearly tragic. But, I'd like to propose that "postjudice", which would be the act of judging based on personal experience, can also be tragic. Personal experience is most convincing, and much harder to counter when conclusions based on it are off the mark. Only a maximum of personal experience can counter the impressions of original experience.