The difference between ignorant and educated people is that the latter know more facts. But that has nothing to do with whether they are stupid or intelligent.
Meaning of the quote
The quote is saying that educated people may know more information, but that doesn't make them smarter or better than people who don't have as much education. Just because someone has learned a lot of facts doesn't mean they use that information in a smart way or that they are truly intelligent. Being educated and being intelligent are two different things.
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