Eeyore is that of knowledge for the sake of complaining about something. As anyone who doesn't have it can see, the Eeyore attitude gets in the way of things like wisdom and happiness, and pretty much prevents any sort of real accomplishment in life.
Rabbit is that of knowledge of being clever. . The thing that makes someone truly different- -unique, in fact-- is something that cleverness cannot really understand. Cleverness, after all, has its limitations. Its mechanical judgements and clever remarks tend to prove inaccurate with passing time, because it doesn't look very deeply into things.
Who is left from the World According to Pooh?